, he ran into a common hurdle. Some of his new buses weren't showing up in the game. After scouring forums like Fellowsfilm Aerosoft Forums , he realized he needed to use the Aerosoft Launcher for certain offline activations and registry updates.

to allow the game to write activation data into the Windows registry. Offline Fixes : For one stubborn DLC, he used a registry file from an Offline Activation Guide to manually "tell" the game it was legal. Steam Refresh : When a download stalled, a quick uncheck and recheck of the DLC in the Steam settings forced a clean reinstall. Finally, with the

Before searching for a key, identify your version:

: If you lack a stable internet connection, some add-ons support an offline method where you enter your serial number and email into the launcher to generate a local activation key.

You’ve just installed OMSI 2: Steam Edition or the classic OMSI der Omnibussimulator , and the screen has gone dark. A small, unforgiving window has popped up: “Please enter your serial number / product activation key.”