Hello Yair,
Since the update error you're facing is related to a DirectX Runtime installation through the Microsoft Store and not a traditional Windows Update and you've already tried clearing the update cache and using the “Show or Hide Updates” tool without success the next step would be to reset the Microsoft Store itself. T
This can help resolve issues with stuck or corrupted installations. You can do this by running the command wsreset.exe from the Run dialog which will clear the Store cache and reopen the app. If that doesn’t work you might consider re-registering the Microsoft Store using PowerShell with administrative privileges.
This involves running a command that reinstalls the Store app without affecting your installed apps or data. If the notification still persists after these steps you could also check for any pending installations or corrupted entries in the Store’s local cache folders which sometimes require manual cleanup.
Regards,
Marcelo