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Follow these guides:
Solution 1:
Download Ultrasurf.
Run Ultrasurf.
Open TruckersMP in Administrator Mode.
Install the available updates (only the first run with Ultrasurf), wait for it to finish and Launch button appears.
Exit Ultrasurf
https://ultrasurf.us/
Solution 2:
In order to verify your game cache, go to your 'Library' and find 'Euro Truck Simulator 2'.
Once you find it, 'Right Click' and go to the 'Properties ' tab.
This will open up the properties tab. Go to the third sub-tab that says 'Local Files' where you will be presented with the following options.
Click on the last option to begin the validation process. This might take a few minutes.
Once all the files are validated, if any corrupt instances are found, then Steam will redownload those particular files for you. If not you will be greeted with a box that says no errors.
You have verified your game cache successfully.
Solution 3:
1. Run the program as an administrator (right click the shortcut and select 'run as an administrator' and accept the UAC prompt.)
2. Run TruckersMP in compatibility mode for Windows 7, please follow this guide http://pearsonsupport.helpserve.com/Knowledgebase/Article/View/210/21/how-to-install-or-run-a-program-in-compatibility-mode-in-windows-7
3. Install these two programs
.NET Framework 4.6.2 https://www.microsoft.com/en-us/download/details.aspx?id=53344
VisualC++ 2015 https://www.microsoft.com/en-us/download/details.aspx?id=48145
Solution 4:
The launcher cannot connect with the TruckersMP server to download the updates. Restart your router and stop any other updates that may use all your bandwidth. Also make sure your Firewall/Antivirus is not blocking the launcher.