Hi There,
We recently had a problem with our Windows 10 to Install .Net 3.5 of Windows Feature when under Proxy. We found out that the installer of Windows has the said installer with it but needs to be triggered by the following steps:
1. Run CMD as Administrator
2. DISM /Image:C:\test\offline /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
God Bless!
Thanks,
Thomie