Follow these steps to fix .NET Framework 3.5 Installation Error 0x800F0950 in Windows 11/10. They are sure to help you fix the issue.

Offline installation of the .Net 3.5 framework from the Windows 8 Disk. In some cases the framework is included with the installation disk that comes with Windows.

Trying to install .NET Framework 4, first went fine, second refuses. Running installation package - both the web installer and full redistribution - returns the following error: ...