Can’t install Office Web Apps Server required .NET 4.5


Windows Server 2012 R2

Office Web Apps Server 2013 with SP1


When performing a brand new Office Web Apps Server installation, we received the error during the installation:

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

We know that we have .Net 4.5 installed when we ran the Office Web Apps server pre-requisites as per the Technet article

However, we also have .NET 4.6 and .NET 4.6.1 installed because we installed all the windows updates.


To get the Office Web Apps Server to install, we had to remove the .NET 4.6 and .NET 4.6.1

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

Once the above .NET versions were uninstalled we were able to complete the Office Web Apps installation, once that was completed we ran windows update and re-installed the .NET 4.6/4.6.1

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