Portable versions often lack full functionality compared to the installed counterpart:
Office LTSC Pro Plus 2021 requires activation via KMS (Key Management Service) or MAK (Multiple Activation Key). Portable repacks often inject a KMS emulator (like KMS_VL_ALL ) into memory. This is why antivirus software frequently flags these portable versions as — because technically, they are. microsoft office ltsc pro plus 2021 portable