Ok, I decided to download the latest curvy Liz model instead of using the 2016 "canon" one and also downloaded some outfits for her (located in D:\SteamLibrary\steamapps\common\SourceFilmmaker\game\usermod\scripts\LordAardvarkScriptData\OL2), but when I load Outfit Loader V3.6 (located in D:\SteamLibrary\steamapps\common\SourceFilmmaker\game\usermod\scripts\sfm\animset\tools), nothing appears in the selection screen. Her base clothes do appear as mdl files, but they too are missing from Outfit Loader. My best guess is that I didn't put the OL2s or some other files in the right place. I'm sorry if I may be annoying with my questions, but I'm new to SFM.
All my assets and tools come with their file structure in-tact. If you're moving things around, picking and choosing where they're going, then you are not installing them the way they are intended to be installed.
The general rule of thumb is you put them wherever they would prompt a Merge. So if the download comes with a usermod folder, as most of them do, then you put them wherever your usermod folder is. Just dump the whole folder, say yes to Merge, say yes to Overwrite.
It will sort everything out.