The INSTALLDIR value will change in the Property table of your msi. The Direct Editor exposes the table view to the dev. As you were not able to change it in the IDE, I thought IDE was misbehaving. In any case, you can save your ism file as binary or xml. With xml you can edit ism with notepad. I had asked you to do that. A search would have eventually taken you to the Property table entry in the xml.
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