Is there any way to automatically uninstall the previous version of my application? In Organize Your Setup -> General Information I have changed Product Version and generated a new GUID for Upgrade Code, but this doesn't work.
You will want to make sure that the Product Version and the Product code are different from the first release, the upgrade code you will want to be the same for both products.
You will want to go to #1 "Upgrade Paths"
Right click and create a new upgrade path and then select your previous installer.
Then rebuild your new installer and it should work.
