It was developed when Windows 8.1 was the primary target, offering high success rates for activation without the bugs found in earlier betas.

KMS Activation, Product Key Injection, and License Backup/Restore. Critical Risks of Using Unofficial Activators

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To use these tools successfully, instructions usually command users to disable Windows Defender or their third-party antivirus suites. Leaving a machine unprotected, even momentarily, invites severe exploit risks from peripheral web threats. 3. System Instability

was a specific pre-release build targeted primarily at Windows 8, Windows 8.1, Windows Server 2012 R2, and Microsoft Office 2013 (and some Office 2016 builds).