The Bus Company Simulator includes an add-on manager. It can be used to install new maps, buses, repaints and mods as well as to check existing maps and buses for errors.
In the add-on manager, click on "Maps", "Buses" or "Objects" to see all available add-ons with a rating from all players. Additionally you can see which add-ons you have already installed. Furthermore you can filter the add-ons after freeware and payware.
Click on "Install" to install the chosen add-on. The add-on manager guides you through the whole installation, recognizes exactly which additionall add-ons are missing and explains you step by step what to do. Even beginners can easily install new maps and buses without having OMSI knowledge.
All maps and buses which you have installed can be checked for errors. The detected errors are shown clearly in a table. For some errors, there is even an assistance available.