When you try to install Windows Server Update Services (WSUS) 3.2 on a server with the Microsoft .Net Framework 4.6 or later versions already installed in it, then you may receive the following error message:
There is a problem with this Windows Installer package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor.
Additionally, the following message is logged on the WSUSSetup.log file:
Install WSUS: WSUS Installation Failed (Error 0x80070643: Fatal error during installation.)
This issue also occurs on System Center Configuration Manager (SCCM) because the Software Update Point Site role depends on WSUS. WSUS is necessary for software update synchronization and compliance assessment scans on SCCM clients.
This issue only occurs if .the NET Framework 4.6 was installed before you install WSUS 3.2.
This issue occurs because WSUS 3.2 cannot detect the newly installed .NET Framework version correctly.
To work around this issue, follow these steps:
Uninstall Microsoft .NET Framework 4.6
Install WSUS 3.2
Reinstall Microsoft .NET Framework 4.6
For more information about the known issues in the .NET Framework 4.6 RC, see Known issues for the .NET Framework 4.6 RC.
For more information about the known issues in the .NET Framework 4.6, see Known issues for the .NET Framework 4.6.
For more information about the product versioning changes and their effects in the .NET Framework 4.6, see Application Compatibility in the .NET Framework 4.6.