@Tutek
Thanks for your posting on Q&A.
The OS version of your WSUS server is Windows Server 2019. Am I right?
should I download and install any service packs/updates for WSUS manually?
I don't found any Official Document for reference to update the Windows Update Agent in windows 10(Server 2016 & 2019). Also there is no need to update the WUA either.
should I download and install any service packs/updates for WSUS manually?
I agree with @Adam J. Marshall . Please try to install the latest Cumulative updates for the server and it will be OK. The Server will keep up to date.
Hope the above will be helpful.
Best regards,
Rita
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