VS2012 .NET 4.0 Clickonce VSTO CryptographicException: SignatureDescription could not be created for the signature algorithm supplied

Question

I have a VS2010 .NET 4.0 VSTO Outlook Addin project that I wish to migrate to VS2012 (but keep it in .NET 4.0). It compiles fine, and runs from inside the IDE just fine, bu

Answer 1

I had this exact same error message and was using VS 2013, .NET 4.5, and signing everything correctly with SHA256.

Finally, I found that an older version of VSTO 2010 Runtime was installed (10.0.40303). Once we updated it to 10.0.40820 everything worked fine. Really hope this helps someone, drove me absolutely bonkers for days trying to figure out what was going on.