The Fitgirl Repack takes this specific build and compresses it heavily.
No, your antivirus might detect some files as virus but they are not They won't harm your PC,just disable your antivirus, install,
“V10047008,” Leo whispered, reading the serial number stitched into the red Yarny’s chest. “FitGirl said ‘better repack.’ She didn’t say isometric .”
: Do not run other resource-heavy programs (like web browsers or other games) while the repack is unpacking. Performance Fixes for Better Gameplay