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If you are in a situation like Mark's, You likely already have the files you need built into Windows, or you should get them directly from the official source. net framework 3.5 free download
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This is the standard method for Windows 10 and Windows 11. It was 4:45 PM on a Friday
Press the Windows Key and type "Turn Windows features on or off". : This is the standard method for Windows
She checked the box and clicked . Windows connected to Windows Update, downloaded the legitimate, secure files directly from Microsoft, and installed them natively. No browsers, no third-party sites, no viruses.
If you are on an older OS or require a manual installer, use these official links: How to Install .NET Framework 3.5 on Windows 11 [Tutorial]