I also got the same issue aswell (happens on all of my PCs, all of them runs Win10 LTSC 2021), plus I even noticing that one of other programs (NVCleanstall, used to install NVIDIA drivers without bloatware, also fails to connect with HTTP timed out on all of my PCs), i'm gonna try to change DNS or something and see if its caused by Cloudflare DNS or not.
Edit: Changing DNS didn't have this issues, but I ran Plutonium on Windows 7 VM (also using Cloudflare DNS) and it managed to connect just fine.
Edit 2: Now the same thing happens to my Win7 VM aswell too for some reasons after launching it second time after it managed to work.