I created a custom CTIOS desktop exe. It works fine on my machine. Now when I want to publish it so that it can be installed on someone else's machine, I gave the path of where I want it to be published. I can install from that path. However whenever the users try to install on theie own machine from that path, they get an error that Interop.HoldCTL needs to be installed in GAC first. See attached screenshot. Can you advise on what may be wrong with the publish app process.