I am trying to sign my Add-In by ESRISignAddIn.exe.
The problem is that our code-signing certificate is issued by an intermediate certificate, "Thawte Code Signing CA - G2". If this intermediate certificate is not installed on the target computer, then the ESRI ArcGIS Add-In Installation Utility does not check the checkbox for "Source is trusted". I can tell our costumers they must install the intermediate certificate, but that's cumbersome.
So I wonder, is it possible to include the intermediate certificate when signing the Add-In? If I had used signtool instead of ESRISignAddIn, I understand that it would have been possible to do so, for example by doing