What is some information on ice overflow?

ICEs are made of custom actions that evaluate static data in a built MSI file. They check things that need to be true, but the database schema cannot enforce. In this sense, it's somewhat like a unit test for a database, but doesn't test a lot of things, such as any of the code for custom actions. InstallScript projects do not create an MSI, so ICEs cannot be used; however InstallScript MSIs do create an MSI.