.Net Framework 3.5 Troubleshooting: installation errors (GPO)

Issue

.Net Framework 3.5 Installation Error: 0x800F0906, 0x800F081F, 0x800F0907

Steps

Follow these steps:

1. Press Win Key + R
2. Type gpedit.msc
3. Go to Computer Configuration
4. Select Administrative Template
5. In Syste
6. (Policy Name -->) Specify settings for optional components installation and component repair
7. Right click --> enabled
8. (Check option) Contact Windows Update directly to download repair content instead of Windows Server Update Services (WSUS)
9. Apply and OK 
10. Win key+R
11. Type cmd
12. Type gpupdate

Now you can install .Net Framework