I have some really important ragdolls that were usable in Gmod 12, but now that I have 13 they all have either disappeared, lost their textures, or now cause the game to crash. I’ve heard a few times that you can rename “info.txt” files to “addon.txt” to make them work. Will that fix it?
After renaming the text files, download the legacy addon mod via Steam workshop and you’ll be able to browse through your GMOD 12 addons so long as the associated text files have been renamed from “info.txt” to “addon.txt”.
This may not fix the texture problems or the occasional crash, though. It didn’t for me at least.