We have machines that we want kept on Windows 10, we don’t want users urged over and over again to upgrade to 11. Run this Powershell, reboot (probably), and we’re good:

# Exit script if this is not Windows 10
If ((Get-ComputerInfo | Select OSName).OSName -notlike "Microsoft Windows 10*")
	{ 
	"This is not Windows 10. Exiting..."
	Exit 
	}
# Proceed
Set-Location -Path HKLM:\SOFTWARE\Policies\Microsoft\Windows
If (-Not (Test-Path -Path WindowsUpdate)) { MKDIR WindowsUpdate }
Set-Location -Path HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
New-ItemProperty -Path . -Name "ProductVersion" -Value "Windows 10"
"Done!"

Note that many so-called solutions out there set things so no further updates, including Windows 10 build upgrades, will happen at all. The above simply limits things to Windows 10.