Script:

setlocal
reg query HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration\ /v CDNBaseUrl
if %errorlevel%==0 (goto SwitchChannel) else (goto End)
:SwitchChannel
reg add HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration /v CDNBaseUrl /t REG_SZ /d "http://officecdn.microsoft.com/pr/492350f6-3a01-4f97-b9c0-c7c6ddf67d60" /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration /v UpdateUrl /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration /v UpdateToVersion /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Updates /v UpdateToVersion /f
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Office\16.0\Common\OfficeUpdate\ /f
:End
Endlocal

Semi-Annual Channel:

CDNBaseUrl: http://officecdn.microsoft.com/pr/7ffbc6bf-bc32-4f92-8982-f9dd17fd3114

Semi-Annual Channel (Targeted)

CDNBaseUrl value: https://officecdn.microsoft.com/pr/b8f9b850-328d-4355-9145-c59439a0c4cf

Monthly Channel:

CDNBaseUrl: http://officecdn.microsoft.com/pr/492350f6-3a01-4f97-b9c0-c7c6ddf67d60

Monthly Channel (Targeted):

CDNBaseUrl: https://officecdn.microsoft.com/pr/64256afe-f5d9-4f86-8936-8840a6a4f5be

Mit den folgenden Befehlen wird der Channel angepasst.

cd C:\Program Files\Common Files\microsoft shared\ClickToRun

OfficeC2RClient.exe /changesetting channel=Monthly

OfficeC2RClient.exe /update user

Quelle: http://blog.icewolf.ch/archive/2018/05/22/office-2016-switch-channel.aspx