@Evol12-5109, Thanks for posting in Q&A. To block installing windows update, you can follow the following steps:
- Create feature update policy to remain at one windows feature version: For example remain at windows 10 22H2 or others. https://learn.microsoft.com/en-us/mem/intune/protect/windows-10-feature-updates
- Create windows update ring policy to set “Option to check for Windows Updates” as disabled to disable the option that users can look for Windows Updates themselfs. That way they can not manually update.
Hope the above information can help.
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