I have now redownloaded it and it says it is activated but its still not showing up. what should I do?
The mod is outdated and doesn't work properly with the new versions of Beamng.Drive, so sadly it is unusable
Wow, really nice car, realistic suspension and transmission also i'm using your sound mod REALLY fun to drive and fps friendly
The unknown category was removed in the last few patches, therefore if a mod is being categorised into it, you are not using the most recent game build. THe mod works fine in current game builds. User error to blame.
For the people that can´t get the mod to work, remember to create a ZIP file with a folder named "vehicles" and inside of that folder put the mod folder, in this case it´s called sierra
By installing the free software known as 7zip. Which is probably the best free archive manager out there, and alot better than many paid ones too (looking at you winrar).