I tried for so long to get out of the Windows Insider Program (that I never signed up for) but finally found a solution that worked for me. The link came from my Microsoft friend. I am on Win 10 Home. I used this link and followed instructions below: "You can set the target feature upgrade version to the current or a newer version of Windows 10 to ensure that you stayed on a specific version of Windows 10." (This fix did not turn off all future Win10 updates) https://allthings.how/how-to-stop-windows-11-update-from-installing-on-your-windows-10-pc/#:~:text=In%20the%20Services%20window%2C%20scroll,status%20to%20stop%20the%20service
Just before rebooting I deleted the whole contents of: C:\WINDOWS\SoftwareDistribution\Download
I did not have to do anything else and Windows 11 no longer tries to load with reboot/update!!!! My last 2 update & reboots installed only Win 10 updates!!!