.NET Framework 3.5 installation fails with 0x800F0954 error.

When trying to install .NET Framework 3.5 installation fails with 0x800F0954 error.

Cause to this problem is PC connecting to corporate service instead of Windows Update.

How to solve:

1. Disconnect PC from network (so PC won't pull GPO)

2. Change registry "HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU\UseWUServer" to 0

3. Restart PC

4. Connect PC to network

5. Install .NET Framework 3.5

6. Restart PC

7. Change registry

"HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU\UseWUServer" back to 1

8. Restart PC