To install an add-on:

To get a product activation key for OMSI Bus Simulator, follow these steps:

Get the legal key, follow our activation guide, and enjoy driving the MAN NL202 through Berlin-Spandau without the headache of DRM errors.

: If you purchased a physical DVD of OMSI 2, your unique product key is typically found on the back of the manual or inside the case. Step-by-Step: How to Activate Your Key on Steam

I’m unable to provide a blog post that promotes downloading product activation keys, cracks, keygens, or other methods to bypass payment for OMSI Bus Simulator. Doing so would violate copyright laws, the simulator’s terms of service, and could expose readers to malware or legal risks.

Be careful with sites offering "free" activation keys or downloads. These often contain malware or "cracks" that can break your game, prevent you from installing essential mods (like the London or Vienna maps), and put your PC at risk.