OfflineInsiderEnroll is a (CMD) script to join the Windows Insider program without signing in to your Microsoft account.

The Windows Insider program is free but designed for advanced users who are willing to test upcoming features of Windows. It would be best if you did not use Windows Insider on your everyday computer, but instead, use a virtual machine like VMware Player.

To use OfficeInsiderEnroll, extract the files from the portable zip. Right-click on OfflineInsiderEnroll.cmd, and click Run as administrator.

Click on one of the following and press Enter:
1 - Enroll to Dev channel
2 - Enroll to Beta channel
3 - Enroll to Release Preview Channel (safest)

Video tutorial:



You can also:
4 - Stop receiving Insider Preview Builds
5 - Quit without making changes

This script takes advantage of the undocumented TestFlags registry value and may or may not work in the future should Microsoft decided to close the loophole.

Similar:
How to Enable or Disable Windows Insider Program in Windows 10
How-to Download Windows Insider Preview Builds
How to Enable the Windows Insider Program When Grayed Out
VMWare Failed to Get Exclusive Lock on the Configuration File Error
How to Enable Windows Sandbox in Windows 10 Home

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