Leo was in a panic. His internet had gone down during a thunderstorm, and he was right in the middle of installing an old but beloved CAD software his engineering firm still used. The installer had stopped dead with the dreaded yellow triangle:
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs : Enables all parent features of .NET 3.5. Leo was in a panic