Trying to run an Excel 2013 VSTO Add-ins project, and I keep on getting an error that says that:
"System.Security.SecurityException: The solution cannot be installed because it is signed by a publisher whom you have not yet chosen to trust. If you trust the publisher, add the certificate to the Trusted Publisher list."
The project has a key file with signature algorithm sha256RSA and certificate issued to/by the Windows User.
Any idea how to get around this ?
Try the solutions from the postings here.
As for myself, I've developed an Excel VSTO AddIn with a self-signed untrusted certificate that is delivered by a custom Setup.exe which is then installed on machines that belong to some end-users. I have no control over these machines because the end-users just download my Setup.exe from a public website. After setup the path of the .vsto is a local file path so I don't need a web server as a host.
In my case the following code (placed in my Setup.exe) is enough to successfully trust the Excel VSTO:
UserInclusionList.Add(new AddInSecurityEntry(new Uri(vstoFilePath),
"<RSAKeyValue><Modulus>...</Modulus><Exponent>...</Exponent></RSAKeyValue>"));
The corresponding <RSAKeyValue> can be found in your .vsto file.
