You can try the manual steps here
https://learn.microsoft.com/en-us/troubleshoot/windows-client/deployment/additional-resources-for-windows-update
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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Hi all,
I have built a Win 2019 Virtual server and need to install .NET 3.5 to run an application. Server manager fails with an error 0x80070002 regardless of what I try
I tried the generic install, changes the source to 'C:\Windows\WinSxS', and tried DISM form the command pro.mpt to look online but nothing seems to work.
Any help would be greatly appreciated.
Cheers,
You can try the manual steps here
https://learn.microsoft.com/en-us/troubleshoot/windows-client/deployment/additional-resources-for-windows-update
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Thanks for the advice, very informative.