How to get C# VSTO to build in .NET framework 4.5

Question

All my projects in my solution are set to build with .net framework 4.5.

I'm trying to create a C# VSTO project however cannot assign the .net 4.5 target framework. This is required so I can reference other projects in my VSTO project.

The error states that the project cannot be used against the targeted framework (.net 4.5).

Alternatively, do I have to implement the excel add-in without using a VSTO project?

Answer 1

There is an updated VSTO 4 redistributable here:

http://www.microsoft.com/en-us/download/details.aspx?id=35594

Notice that in this release the version has been bumped from 10.0.31119.0 to 10.0.40302.0 and it also supports Office 2013.

This release also works for both the x86 and 64 office installs, eliminating the need to choose the correct installer which is nice.

Update It seems the previous download page has been removed. You can try to get the installer from the direct link:

http://download.microsoft.com/download/9/4/9/949B0B7C-6385-4664-8EA8-3F6038172322/vstor_redist.exe

Update 2 Microsoft has released VSTO 10.0.40303.0, a fix for 10.0.40302.0, on 12/21/2012 and it is available from http://www.microsoft.com/en-us/download/details.aspx?id=35594 again.