Wednesday, April 24, 2024

[RESOLVED] Can´t install Office Web Apps Server because it requires .NET 4.5

While you are installing an Office Web Apps Server 2013 for your Skype for Business deployment you received the following error during installation:

“Setup is unable to proceed due to the following error(s): This product requires Microsoft .Net Framework 4.5”

You now started to troubleshoot the issue:

1.) Make sure that you installed all the prerequisites:

Add-WindowsFeature Web-Server,Web-Mgmt-Tools,Web-Mgmt-Console,Web-WebServer,Web-Common-Http,Web-Default-Doc,Web-Static-Content,Web-Performance,Web-Stat-Compression,Web-Dyn-Compression,Web-Security,Web-Filtering,Web-Windows-Auth,Web-App-Dev,Web-Net-Ext45,Web-Asp-Net45,Web-ISAPI-Ext,Web-ISAPI-Filter,Web-Includes,InkandHandwritingServices,NET-Framework-Features,NET-Framework-Core,NET-HTTP-Activation,NET-Non-HTTP-Activ,NET-WCF-HTTP-Activation45

which also included the 4.5 .net Framework

2.) Now check which .net Framework you have installed (more infos here) via:

Get-ItemProperty -Path “HKLM:SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full” | Format-List Release

If that shows a version higher then 4.5 you might have already run Windows update and during this you installed a .net Framework and updated it to 4.6.



A solution which worked for me was to uninstall the following updates:

For .NET Framework 4.6.1 we removed the following KB: KB3102467
For .NET Framework 4.6 we removed the following KB: KB3045563

After they where removed and after a reboot from the OS was initiated I was able to install Office Web Apps Server 2013 without any issues.


Note 1:

Please keep noted that the .NET Framework version 4.6 and higher includes a new Just-In-Time (JIT) compiler which might cause issues with your MS Office Web Apps Server 2013 deployment. Microsoft mentioned here to disable that via:

Then, add the following:
Value name: useLegacyJit
Type: DWORD (32-bit) Value (also called REG_WORD)
Value: 1

When using .net Framework version 4.6 with Office Web Apps Server 2013


Note 2:

Keep noted that using .NET Framework 4.6 might also prevent you from updating/patching MS Office Web Apps Server 2013, so a good option might be currently to block the .NET Framework version 4.6 from being installed via Windows updates as explained here.

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