wanted to know if it's possible to download offline updates for say, windows server 2019 standard
Yes, of course you can download them
https://support.microsoft.com/en-us/topic/windows-10-and-windows-server-2019-update-history-725fc2e1-4443-6831-a5ca-51ff5cbcb059
from the windows update catalog
https://www.catalog.update.microsoft.com/
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