[Can't join ProMods server, everything freezes]

I reinstalled the launcher at it works 

[Can't join ProMods server, everything freezes]

When opening the game through the launcher everything is fine until I select the ProMods server.
When I do the game just freezes on the server screen.

I tried joining the base game server and everything works fine. What should I do?

[The game won't stop "loading"]

I have fixed the issue.
I have persuaded a friend to download TruckersMP and then copied the files from his files into mine and it works.

[The game won't stop "loading"]

My launcher does not want to update. Every time I open the launcher it says "Download Update", but upon clicking the button, something loads (I saw the number 129) and then it just constantly loads.
I researched this topic on your forums and found possible methods that would solve my problem.
When attempting these methods step-by-step, non of them worked and the problem persists.

What I am doing:
1. Opening the Launcher through the shortcut located on my Desktop (I even tried Administration mode)
2. Pressing the "Download Update" button.
3. Waiting.

4. After a long period of time (5-10 minutes) it shows me one of 2 error messages:
- "Failed to validate *something*" - something along those lines (I don't remember it very clearly)
- "Failed to download *something*" - something along those lines (I don't remember it very clearly either)