Hello there! @PipoMS
First of all, Welcome to TruckersMP Forums, especially in Help Section
I would like introduce myself before I will going to help you with your issue I really appreciate you shared your issue with us!
My name is Petr (RedWolf_TMP), and I am one of Support Team Members (Support Trainee) here on TruckersMP. My work is based on asnwering/helping to others with their issues/questions as soon as I am able to. I will do best for answering your question.
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Answer to your question/issue:
In lots of cases it being resolved with starting TruckersMP Launcher as Administrator (right click on TMP - launch as admin)
If it does not work for you, then please re-install TruckersMP Launcher with these steps:
Press the Windows Key + R (Win+R) on your keyboard
Enter "%programdata%" and press Enter (without the quotes)
Find the folder "TruckersMP" and delete that folder.
Go to documents and delete this folders called (ETS2MP, ATSMP)
Navigate to C:\Program Files\ and delete the folder named "TruckersMP Launcher"
Go to our website and re-download and install the Launcher with admin privileges https://truckersmp.com/download/
Open The Launcher with admin privileges and click "Install Available Updates"
If it wont help to you, please let us know, we will continue in solving your problem!
Sincerely,
RedWolf_TMP
TruckersMP Support Trainee