This is mostly caused by an onsite WSUS server that does not have the hosted library in the repository.
Then run this command in powershell. Make sure you change the folder to where you saved the file or put it into a folder named Installs on the C drive.
Dism.exe /online /enable-feature /featurename:NetFX3 /source:C:\Installs /LimitAccess
Depending on the speed of your machine this may take a minute or up to five.
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