.net Framework Offline - Installer For Win 8.1-10...

By downloading the official —specifically the 4.8 runtime and the DISM-based CAB for 3.5—you gain full control. Save these files to a USB drive, a network share, or your local C:\Drivers folder. You will never be caught off guard by the “connecting to Windows Update” spinner again.

Not running the installer as administrator. Fix: Right-click the .exe or Command Prompt → “Run as administrator”. .NET Framework Offline Installer for Win 8.1-10...