Almost all KMS tools are flagged as "HackTool" or "Generic Malware" by Windows Defender. This is normal for activators, but only proceed if you trust the source. The Risks of Third-Party Indexes
Older KMS tools may not support the latest security patches of Office 2021, leading to activation "grace period" errors. Conclusion index of kms activator office 2019 2021
Currently the gold standard. It is open-source, hosted on GitHub, and uses HWID or KMS38 methods that are much cleaner than older tools. Almost all KMS tools are flagged as "HackTool"
If you find a direct link in an index, follow these precautions: Conclusion Currently the gold standard
Some files are modified to include keyloggers or miners.
When you search for "Index of [File Name]," you are looking for open directories—servers that list files without a fancy webpage interface. Users prefer these because: