Community Answers
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darlykappa's post in Can't launch ETS2MP Because of new update. [0.2.1.7.0] was marked as the answer
If you use MSI Afterburner and RivaTuner Statistics Server by chance, make sure to update the RivaTuner Statistics Server to the latest beta version 7.0.0 Beta 19. This fixed my issue with the TMP Launcher.