Vanilla Upscale Script v0.93b (Patreon)

Small change to the Vanilla Upscale Script, it now detects if a snapshot version was selected (used to throw an error).

For now, inserting a snapshot version automatically assumes it's a post-flattening version. If required I could try and adjust it so it detects if the snapshot relates to a pre- or post-flattening version but I suppose there's no point in using outdated snapshots anyway.