OfflineInsiderEnroll is a (CMD) script to join the Windows Insider program without signing into 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:
0 - Enroll in Canary channel
1 - Enroll in Dev channel
2 - Enroll in Beta channel
3 - Enroll in to Release Preview Channel (safest)

You can also:

4 - Stop receiving Windows Insider builds
5 - Quit without making any changes

Video tutorial:

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This script takes advantage of the undocumented TestFlags registry value and may or may not work in the future should Microsoft decide 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