How to stop Acrobat from auto updating

Hello, running Acrobat Reader 21.007 installed on an image on a Citrix farm and it keeps auto updating to the latest version after the servers boot up (when users sign in?)

I have:

-disabled the update service

-disabled the update task in task scheduler

-changed the registry key: hklm\software\wow6432node\adobe\adobe arm\legacy\reader\<random #>  Mode 3 changed to Mode 0

Do I need to take more drastic measures and edit my hosts file so it can't resolve armmf.adobe.com?  WTH Adobe.

Everytime your application updates it breaks a medical application.