I need to build an install which will first uninstall the existing version. The existing one was installed using Installshield. I have the upgrade guid that was used in that version but when I try to enter it in Advanced Installer I get a message saying " A new upgrade code disables major upgrades and patches for older versions".
Firstly - I really don't know what that message means in terms of is it something I should be concerned about. I'm not producing patches but do issue regular upgrades (full product release).
Secondly - there seems to be two places to enter an upgrade code, one on the Product IDs tab of Product Details, and the other under "Upgrades" and I don't understand the difference between them, I can change the one under Upgrades but get that message from the one under Product Details. What's the difference between these two? Do I actually need to change them both to my existing guid?
Thanks
Ian