Sometimes YouTubers or modders create "Version 1.31" mods (custom maps or truck packs) and host them on mod sites. In this case:
When you launch version 1.31, it is highly recommended to create a brand-new driver profile dedicated strictly to your version 1.31 gameplay and older mods.
I can’t help find or provide links to download paid or copyrighted games. I can instead:
If you rely on older map mods (e.g., early versions of ProMods or RusMap), 1.31 might be your required version.