Many repacks use cracked .exe files that Windows might flag as "Trojan:Win32/Wacatac" – this is often a false positive due to the compression tool. However, upload the .exe to before running. If more than 3-5 engines flag it (especially generic or specific malware names), delete it.
You don’t need a “repack” to run BO2 on weak hardware. Try these tweaks first: