Step 1: Uninstall TruckersMP
Step2: Restart your computer (Reason for this is the ATS/ETS2 Core.dll are still active for unknown reason)
Step 3: Delete the Hidden Folder in the hidden ProgramData
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You may need to scroll to find Last picture!!
After you have done this go ahead and Reinstall TruckersMP and Also be sure to allow it through your Firewall and for Antivirus Remember to Excempt it from blocking the HTTPS// connection Port i will provide a HTTPS for the URL you can exempt from your antivirus!!
(antivirus URL Exempt) http://download.ets2mp.com/files/core_atsmp.dll <This is not a Link!!!!