Before diving into the "how," it is important to understand the "why." The developers, BeamNG GmbH, constantly update the game engine. This often breaks older mods.

Old mod data from your current BeamNG installation will crash version 0.18. Navigate to Documents\BeamNG.drive .

While modern versions require more power, the 0.18 build is relatively accessible: Changelog | BeamNG.drive Wiki | Fandom