Hi @Troy
1) "is upgrading from Windows 10 pro to Windows 11 pro free?"
a) Yes, it is free to upgrade from Windows 10 Pro to Windows 11 Pro.
b) Make sure that you have the right requirements for Windows 11 as well (check the Minimum system requirements section):
https://www.microsoft.com/en-us/windows/business/windows-11-pro
2) "how do you upgrade to 11 on domain joined PCs?"
You can try deploying the script (I would recommend trying on a couple of devices first):
$workingdir = “c:\temp”
$url = “https://go.microsoft.com/fwlink/?linkid=2171764”
$file = “$($workingdir)\Win11Upgrade.exe”
If(!(test-path $workingdir))
{
New-Item -ItemType Directory -Force -Path $workingdir
}
Invoke-WebRequest -Uri $url -OutFile $file
Start-Process -FilePath $file -ArgumentList “/Install /MinimizeToTaskBar /QuietInstall /SkipEULA /copylogs $workingdir”
Cited from https://community.syncromsp.com/t/windows-11-upgrade-script/2846/15
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If this is helpful please accept answer.