You might get this if you're using Chrome:
That's because it contains an executable. Feel free to scan it with your antivirus if you think it's malicious.
• removed more code (part that was triggering the antivirus to flip out)
• removed more assets to make the footprint smaller
• minimizes itself once you press play (if you insert the wrong password sadly it still minimizes)
• saves the username and password more safely
Installation steps are the same, just shove it in the Warhammer Online folder, unblock the executable, run as admin; optionally you can use the Performance Counter Rebuilder from here and you can remove the read-only attribute from the Warhammer folder.
