"Unable to complete version check" even after reinstalling

https://i.imgur.com/yJVO0GC.png
After I got this error suddenly on start up, I tried to solve it: changed connection, changed the number in the text file (can't remember the name of it right now). So I uninstalled the game completely with CCleaner and everything related to it and re-downloaded the client. This error still shows up immediately on launch. Would appreciate any help :l

This might not be related but other programs like discord and pingzapper also suddenly stopped working along the game, so maybe it has something to do with my PC. Other games still work though.
Windows 10 64 bit

Hi, were you able to resolve the issue? I'm having the exact same problem.