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I have dutifully been creating new Executable Versions each time I make any changes to my application and then creating New Installers with this new executable. For the Installer I did not click on the "Generate" button to change the Upgrade Code in the Version Information category - the Installer does this automatically. ie. each new Installer had a new Upgrade Code. Now each time I have run the NEW Installer version it automatically uninstalls the old version and installs the new version - all very nice and simple But today I needed to go BACK a version so I ran the previous installer expecting it to automatically do the same thing, but it won't let me. My questions are: 1) Firstly can this be done, or can you only upgrade to newer versions? 2) What is the "Generate" button for if the NI Installer generates a new Upgrade Code anyway? 3) How can I get the NI Installer to upgrade and downgrade and application? Chris