The risks far outweigh the benefits. Modern Windows Defender and SmartScreen are excellent at detecting known KMS activators precisely because they are almost always bundled with remote access trojans (RATs) or info-stealers.
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To activate Office 2019 without an internet connection, you must set up a KMS host and activate that host itself through Microsoft’s official telephone activation Microsoft Learn 1. Set Up the KMS Host The risks far outweigh the benefits