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✨ ModNest 1.1.3 — Mods & CC Organizer for The Sims 4, now on Mac + Windows (Members' Download) ✨ (Patreon)

Published:
2026-10-21 23:18:10
Edited:
2026-10-25 12:56:19
Imported:
2026-10
Tags:

Downloads

Content

Hiii! Your Mods folder is about to get SO much cuter and tidier, and now that goes for Mac Simmers too!!

ModNest is a little Y2K-style desktop app that sorts your Sims 4 Mods folder for you. No more scrolling through 5,000 loose .package files!

‼️ Works on Windows 10 and 11 AND on Mac (macOS 12 Monterey or newer, Apple Silicon and Intel). Pick the download for your computer below. ‼️

What’s new in 1.1.3 ✨

ModNest for Mac is HERE! It’s the same app with the same pink look and every single feature from Windows: Preview, Organize now, Undo last run, Find Bad Mod, My Mods, Mod Sets, Check my saves, Tools and Send Feedback.

Mac extras: it opens .zip, .rar and .7z files by itself (no extra apps), picks up downloads Safari already unzipped for you, ignores Finder’s hidden junk files, checks that iCloud didn’t take your mods off your Mac, and fixes a Resource.cfg copied over from a PC.

Windows (small fix): Find Bad Mod could show “Something went wrong: Object reference not set to an instance of an object.” when you clicked Put them back. It happened when a parked mod had the same name as a different file already in your Mods folder. Now ModNest leaves that one parked, puts the rest back, and tells you which folder it’s in, so you can keep whichever copy you want. The Mac version has this fix too.

Already have ModNest? Download the zip for your computer below. The Mac version is a free update, so you don’t need to pay again!

Also fixed in 1.1.3 ✨

Organize no longer stops at the very end with “You do not have sufficient access rights to perform this operation.” Now a folder or file your computer won’t let ModNest move is skipped, everything else gets sorted, and it’s listed in the report under “Couldn’t move”.

What it does

Sorts all your CC automatically: hair, makeup, clothes, shoes, accessories, pets, Build/Buy, gameplay mods and more. It reads what’s inside each file, not just the name.

Grabs new downloads from your Downloads folder and unpacks .zip, .rar and .7z files for you.

Sends downloaded Sims, families and lots to your Library.

Moves broken, duplicate and game-breaking files out of your Mods folder safely (it never deletes anything).

Updates made easy: download a newer version of a mod and ModNest swaps it in for you, keeping the old one aside just in case.

Preview mode shows you where everything will go before anything moves.

Undo last run puts everything back exactly how it was.

Find Bad Mod: if your game says “Unable to start,” it helps you find the exact file causing it in just a few launches.

My Mods: every file with its picture. Search, turn mods on/off, rename, and save Mod Sets (like “Legacy save” or “Build only”) to switch in one click.

Check my saves: see which CC your saves and saved Sims actually use, and which you never use.

Tools: Health check, back up your Mods folder, clean empty folders, and clear the thumbnail cache.

Report: you get a report after every run showing what moved, duplicates and mod conflicts.

Look: pink Y2K style, or switch to a clean modern look in Settings.

Made for HUGE Mods folders: tested with 100,000 mods.

How to install on Windows

Download ModNest-1.1.3.zip (attached below), right-click it and choose Extract All.

Close The Sims 4.

Open ModNest.exe. It finds your Mods folder automatically.

Press Preview to see what will change, then Organize now.

“Windows protected your PC”? That’s normal for new apps from small creators. Click More info → Run anyway.

How to install on Mac

Download ModNest-1.1.3-Mac.zip (attached below). Safari unzips it for you, so double-click ModNest-1.1.3-Mac.dmg in your Downloads (if you still see the zip, double-click that first).

A pink window opens: drag ModNest onto Applications. Then eject the ModNest disk in Finder’s sidebar.

Close The Sims 4 and open ModNest from your Applications folder.

The first time, your Mac says it can’t check ModNest. That’s normal for apps from small creators (ModNest isn’t signed with Apple yet). Click Done, then go to System Settings → Privacy & Security, scroll down and click Open Anyway next to “ModNest was blocked”. It asks for your password once. (macOS 14 or older: right-click ModNest → Open → Open.)

Click Allow when ModNest asks for your Documents and Downloads folders. It finds your Mods folder automatically.

Press Preview to see what will change, then Organize now.

After you update ModNest on a Mac, macOS asks one more time: just do the same Open Anyway steps again.

Want a demo? Visit my website for more info and an interactive demo - https://katiescustomcontent.com/

Tips

New to mods? No problem! The first time you click Organize now, ModNest sets up all your folders for you.

In the game, make sure Enable Custom Content and Mods and Script Mods Allowed are both on (Game Options → Other). The Health check in Tools checks this for you!

Changed your mind about a run? Just press Undo last run.

Shortcuts: Ctrl+1 to Ctrl+7 (Windows) or Cmd+1 to Cmd+7 (Mac) jump between the pages.

On Mac, the ModNest menu at the top of your screen says “About Avalonia” (that’s the toolkit ModNest is built with). It’s harmless! ModNest’s own About is Cmd+7 and Settings is Cmd+5.

Found a bug or have an idea? Use Send Feedback inside the app. It helps me fix things fast!

Thank you SO much for supporting me so I can keep making tools like this! 💗

ModNest is a fan-made tool and isn’t affiliated with or endorsed by Electronic Arts. The Sims is a trademark of Electronic Arts Inc.

Downloads are below: ModNest-1.1.3.zip for Windows, ModNest-1.1.3-Mac.zip for Mac

Files

Comments

Katie M.

absolutely! thank you so much! feel free to reach out if you have any questions or encounter any issues!

tonya

thank you so so much for making something like this, ive been waiting for someone to make something like this for years. the free ones just dont do the best or i have to do it manually and i dont have time for that lol

Katie M.

omg this makes me so happy 😭💕 i made it because i know how frustrating it is to organize everything manually, especially when the free ones don’t work the way you need them to!! thank you so much for the support 🥹🫶 stay tuned for upcoming updates!

kittynocturne

Just wondering does this use AI at all?

Katie M.

The app itself doesn’t use AI at all 💗 It reads what’s inside each file and follows set rules, nothing guessed. We code it ourselves (CS degree!) and use AI as one of our tools simply just for stress testing and MINOR tweaks, like all devs do these days ✨

kittynocturne

Yay so happy to support then! Thank you for this amazing application ♡

Adonni_a

Saw this on my fyp and bought it

Katie M.

Yay, welcome!! 💗 Thank you so much! There's a full walkthrough video on my website that shows every feature step by step: https://katiescustomcontent.com/ ✨ Hit Preview first to see the plan, then Organize now. If anything looks off, Send Feedback in the app and I'll help!

stargirl_gaming

saw you on tiktok and decided to buy i really hope it works because my sims game has been broken and ive been to lay to fix it

Katie M.

Welcome, thank you so much!! 💗 If your game won't start, use Find Bad Mod. It does the 50/50 for you and finds the mod causing it. If it starts but acts weird, run Preview then Organize now first, and it'll pull broken files into Quarantine. The walkthrough on my website shows every step: https://katiescustomcontent.com/ ✨ What's your game doing? Tell me and I'll point you to the right button!

Katie M.

Of course!! 💗 Enjoy your newly organized Mods folder, and message me anytime if you need help ✨

JMT Fun

My Windows says its a virus.....

Katie M.

So sorry for the scare 😭💗 ModNest isn’t a virus! It’s new and not code-signed yet, so Windows shows a blue ‘Windows protected your PC’ box. Click More info → Run anyway ✨ If Windows Security actually blocked or removed the file, please DM me a screenshot so I can help 💗

stargirl_gaming

My game is starting but when i go into the game the ui bar dissapears and wont save. i already did the organize button is there another button to try and fix it?

Katie M.

Oh no 😭💗 A missing UI bar and not being able to save almost always means a script mod is outdated after an EA update, usually UI Cheats, MCCC or another big script mod. Try this: 1. Check each script mod's page for an update and download the newest version 2. In ModNest, go to Tools → Clear cache 3. Look for a lastException file in your Sims 4 folder; it often names the mod causing it Still stuck? Try Find Bad Mod: load a save each round, and if the UI is missing, answer 'It showed an error' 💗 DM me if you need help!

stargirl_gaming

i did actually fix my game i had to 50/50 my mods but the organizing your organizer did helped save so much time!! def would reccomend!

Bri

Hi! How will I know if the organizer is working? Does it show files moving in real time or will everything change once the organizer is done?

Miranda Hicks

i was literally just complaining to by boyfriend about how i'm rebuilding my mod folder and i'm too lazy this time around to organize it, then your tiktok showed up on my fyp (kudos to the fbi agent!!)! this is absolutely genius. youre doing gods work

Katie M.

LMAOOO 😭😂 the FBI agent came through!! 🫶🏽💕 I’m so glad my TikTok found you at the perfect time! Hopefully ModNest saves you so much time and stress with rebuilding your Mods folder 🥹✨

Katie M.

Hi!! 💕 You’ll be able to see the progress as ModNest organizes your files! 🫶🏽 Depending on how large your Mods folder is, it can take a little time to finish, so just let it process and your files will be organized once it’s done! ✨ I’ll be adding a progress bar in the next update!

vivian juarez

I want to give you the fattest kiss rn you have saved me so much time and energy! im gonna tell every simmer i know that they need this ASAP!!!

Katie M.

STOPPP this made my whole day 😭💗 Thank you SO much for spreading the word, enjoy all that extra simming time!! ✨

Christa Templeman

I saw this on tik tok and IMMEDIATELY downloaded because i have a huge mod folder (emphasis on huge 257 GB) and and nothing is organised so this might be a gamechanger. i am currently running the preview tool but just wondering how long i should wait before trying to restart the program since its been like 20 minutes or so and it showed all the import from downloads files then hasnt changed since doing sims tray files (I hope this makes sense) xx

Christa Templeman

Also is there an eta for the progress bar update angel x

Katie M.

Yay welcome!! 😭💗 That makes total sense! After the Tray step, ModNest reads every single file to work out where it goes, and that part doesn't show anything until it's done. With 257GB and it’s your first pass it can take a while, so it's not stuck, just thinking! A few tips: • Keep your PC plugged in and don't let it go to sleep • If your Mods folder is on an external drive or in OneDrive, it'll be slower • If you do need to close it, that's totally safe during Preview, since Preview never moves anything The progress bar is coming in our next big update! There's no exact date yet, but it's at the top of our list ✨ Thank you for your patience, angel!! 💗

Bluxbxrri

Thank you so much for this tool. I was just wondering how long I should wait for my game to load before I log it as an issue. Some mods have made my game take 30+ mins to load, and then I run into an infinite loading screen after I enter my world/household. But I don't get any error messages.

Katie M.

Thank you so much!! 💗 An infinite loading screen counts as the game not working, even without an error message. When Find Bad Mod asks, answer 'It showed an error' if it's still stuck. How long to wait: big Mods folders really can load slowly, so give it about 15 minutes at the loading screen. If it hasn't moved by then, call it stuck ✨ Each round has fewer mods in, so the loads usually get faster as you go! A couple of things that help load times too: • Tools → Clear cache before you start • My Mods → Check my saves shows CC you're not using. Turning that off makes the game load faster 💗

Loookahs

Hey, so I have a problem: Windows is SURE that this is a virus, and I can't download it. Any help?

Katie M.

So sorry about that 😭💗 ModNest is safe! Windows is extra careful with new apps from small creators that aren't 'signed' yet. We've sent it to Microsoft to review, and we're getting it signed so this stops happening. Please DM me and I'll help you get it working ✨

Loookahs

I have no idea what you did, but now it works? Must have been your comment magic, lol

Katie M.

Hahaha the comment magic is real 😭💗 Microsoft must have finished checking it! So happy it works now. Enjoy your organized Mods folder ✨

Betra Smith

it keeps saying sims is open?

Katie M.

Ahh that usually means the game is still running in the background, even if you closed it 💗 Try this: • Windows: press Ctrl + Shift + Esc to open Task Manager, find The Sims 4 (or TS4_x64), click it and press End task • Mac: press Cmd + Option + Esc, pick The Sims 4 and click Force Quit Or just restart your computer, that always works ✨ Then open ModNest again and it'll let you Organize! Preview works even with the game open 💗

Betra Smith

so my find bad mod isnt working its just says ' the specified path, file name or both re too long. the fully qualified file name must be less that 260 characters and the directory name must be less than 248 char' anyway to fix?

Katie M.

So sorry about that 😭💗 That's a known bug we're fixing in the next update! It happens when some of your mods sit inside folders with really long names, or folders nested inside copies of themselves (like 'CC Set\CC Set\CC Set...'). Here's the fix for now: 1. In ModNest, go to Tools → Health check. It lists folders it couldn't read and CC that's too deep 2. Open those folders and rename the outer ones to something short (like 'CC1'), or move the files up so they're not nested so deep 3. Run Find Bad Mod again ✨ Tip: if your game only broke recently, pick 'Since' + the day you added new mods instead of Every mod. That checks fewer folders and may skip the long ones! And for anything else, please use the Send Feedback button inside ModNest 💗 It sends us your details, so we can help you much faster!