Hi,I am using IIS to publish the installer of my Addin developed using Addin Express 2010. The solution is published to local IIS. The files while publishing contains solutionname.exe, setup.exe, .msi and .XML file. It is like Clickonce installation. The clickonce installs correctly without any error but the publish methid which they have suggested is not working in our system. The reference to the topic in their site ishttp://www.add-in-express.com/creating-addins-blog/2010/04/09/clicktwice-msi-web-deployment/http://www.add-in-express.com/creating-addins-blog/2010/04/15/msi-deployment-publishing-application/http://www.add-in-express.com/creating-addins-blog/2010/04/16/msi-based-web-deploymentmanaging-updates/I tried giving all possible permissions to folder, virtual directory (anonymous access, Intgrated Windows) but still not able to install as they are able to. What could be the reason I am getting the authentication error.Thanks in Advance,Malik Z.1 person needs an answerI do too