I have read all the detailed documentation on major, minor, etc. upgrade types but I’m not sure how to use InstallShield UI correctly. I’m sure this is stupidly simple but I just can’t get a handle on it.
After creating the initial install .ism do I create a new .ism file and add the next upgrade elements or do I keep adding to the same .ism? If you do use the same .ism when is the best time to use a new .ism?
As long as you use version control and can always get back to your previous files, there's no big problem in using the same ISM file and just updating. Although I do fork and technically work on a copy between major releases. I only recreate ISM files if i'm moving to a drastically different setup architecture and would like to start fresh.
As an example today I created a new install that is a major upgrade of my previous software (well actually it's a major upgrade to about 4 previous versions of my software), all i did is open my ISM file and create new guids for Package Code, Product Code, and change the Product Version. (FYI, if it were minor upgrade I would just do the Package Code and Product Version).
