Save your work and close browsers, Excel, Word, or any development environments (Visual Studio, SQL Server Management Studio). The installer may require a reboot.
The progress bar will move slowly. Do not interrupt the process. If Windows Update is running in the background, the installation might take up to 20 minutes. download microsoft net framework 4.5 2 offline installer
| Error Code | Description | Solution |
| :--- | :--- | :--- |
| 0x80070643 | Fatal error during installation | Run Windows Update, reboot, then re-run the offline installer as Admin. |
| 0x800f0922 | CBS (Component Based Servicing) corruption | Run DISM /Online /Cleanup-Image /RestoreHealth and sfc /scannow. |
| 0x80240017 | Unsupported OS or missing update | Install KB2919355 on Windows 8.1 or KB3063858 on Windows 7 SP1. |
| 0x800713ec | .NET 4.5.2 already installed | Go to Control Panel > Programs > Turn Windows features on/off. Verify it’s checked. |
| Hanging at 99% | Windows Update conflict | Stop Windows Update service (net stop wuauserv) and retry. | Save your work and close browsers, Excel, Word,