Hello @Beatlejpeg,
If you're experiencing an "installation has failed" error, here are several potential solutions you can try:
Check for Antivirus Interference
Antivirus software may block the installation process. Try completely uninstalling any third-party antivirus programs and temporarily disabling Windows Protection
Update Game Version
Ensure you have the latest game version. In Steam, go to Properties > Betas and set it to "None". Using an unsupported version can prevent the launcher from working correctly
Delete the following folders (including all files inside them):
C:\Users\YourName\AppData\Local\TruckersMP
C:\Users\YourName\AppData\Roaming\TruckersMP
Then restart your PC before reinstalling
Uninstall and Reinstall the Launcher
Remove the current TruckersMP launcher, restart your PC, and download the latest installation file from the official TruckersMP website - > https://truckersmp.com/download
Lastly, if you could click the "Open Setup Log" and share a screenshot of the error shown there, that would be very helpful for the Support Team and other users to better assist you.
I hope one of these suggestions helps you resolve the issue and get everything working smoothly!
Kind regards,
Leeroy*