Often caused by incompatible graphics drivers or incorrect DirectX settings.

This is the most critical question. Because 7Launcher injects code into the ETS2 process, it can be flagged by anti-cheat software (though ETS2 has no anti-cheat for single-player). However:

7Launcher is a functional alternative for those looking to manage ETS2 without Steam. However, it lacks the social features and "Steam Workshop" integration of the official version, meaning you’ll have to source your mods manually from sites like SCS Software's forums for the current version of ETS2?