Error codes, log files ( C:\Windows\Logs\DISM\dism.log ), bypassing WSUS using HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate\AU\UseWUServer .
Or using the feature name with source pointing to the folder containing the CAB: cab file for .net framework 3.5
Even with the correct CAB file, you may hit snags. Here’s how to resolve them. Error codes, log files ( C:\Windows\Logs\DISM\dism