Copy the existing Vehicles folder to your desktop. If the new bus crashes, you can revert.
Remember to source your download exclusively from the developer’s official store or Patreon. Support the modding community, and they will continue to deliver the most detailed, realistic electric buses available for any simulator on the market. omsi+2+solaris+urbino+18+iv+electric+download+exclusive
Typically: C:\Program Files (x86)\Steam\steamapps\common\OMSI 2 Copy the existing Vehicles folder to your desktop