Had the whole patch downloaded and after gameguard couldnt get the game startup. somehow got it reopen now it is redownloading the patch tf

I am having the exact same issue.

If you have a free AV, disable it. They will detect GameGuard as a false positive.

I'm having the exact same issue, added an exception on my AV for the entire game folder, still wants me to redownload the entire game from scratch