Is there some way to optionally turn this off and have AI only ask if the project should be saved only when closing?
(Similar to when using the test "UI Installation" function)
I'm afraid we don't have support for this. Maybe we'll add this improvement in a future version of Advanced Installer thank you for your suggestion. However, since your is the only request implementing this has a very low priority for the moment.
You might consider putting your project files under some sort of version control. That way you can always revert back to your most recent known-good version.
We recently acquired the most recent release (Pro version). Was a toggle ever added to the software to NOT save the project on build? Otherwise is there a command line switch for batch files?