FitGirl repacks use compression algorithms that some antivirus programs flag as false positives. Add the download folder to exclusions.
In FitGirl repacks, selective files allow you to skip:
"good report" (all files OK) for your Batman: Arkham Knight FitGirl repack
If you have limited monthly data or a slow connection, the FitGirl repack is a godsend. If you want cloud saves, achievements, and automatic updates, buy the original.