A Windows 10 USB drive or an ISO file mounted as a drive (right-click the ISO > Mount).
You just tried to install an older game, a legacy accounting tool, or a specialized piece of engineering software. Suddenly, you are greeted by this pop-up: windows 10 download .net framework 3.5
Note the drive letter of your Windows USB/ISO. (e.g., D: ). A Windows 10 USB drive or an ISO
Don’t panic. You don’t need to hunt through shady "download dot net" websites. In fact, a legacy accounting tool
Here is the using your Windows 10 Installation Media (USB or ISO).
Dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess Press Enter.
Windows will reach out to Windows Update, grab the necessary files, and install them. This takes about 2 minutes. Once done, restart your software.