So when I first tried running the launcher and downloading the game it got stuck at 90% downloaded (for some people it was 91%) and it said "HTTP client transport failure. I did some researching but couldn't find anything on the forums. I know a few other people have been having this issue as well. So I went and looked at some other forums and found a fix. There's a thread on this forum that says to just wait and let the launcher sit but that doesn't work.
Step 1. Close the launcher.
Step 2. Disable your anti-virus (sketchy I know just trust me here).
Step 3. Run the launcher as an administrator.
Step 4. Download the game and play!
If my fix didn't work then check these threads (these methods didn't work for me but they might work for you). Also, if you could add my fix to these threads I'd really appreciate it, thanks!