A mod designed for v1.15 or later will almost certainly crash v1.11.1. Always check the mod’s manifest file or forum post for explicit version support.
. Because this is an legacy version, finding compatible mods requires using archived sources. trucksimulator.wiki.gg 1. Where to Find Free Mods for v1.11 euro truck simulator 2 v 11 1 mods free
If you own the game on Steam, the Workshop is the easiest way to manage mods. A mod designed for v1