I'm having a similar issue, but I can't even download the game without my PC stopping it and saying that the file I was trying to download may cause harm to my PC. It has never done this before, only with this new update.
I do not have any active antiviruses installed, only just the PC's antivirus it basically comes with.
Hey there! I also get the anti-virus thing that pops up, there should be an option that says "more info" and clicking it should give you the option to "Run anyway"
I assure you the game doesn't have any viruses!