It's probably worth mentioning that in this case, "ICE" stands for "Internal Consistency Evaluators" and not "Immigration and Customs Enforcement."

One level up => https://learn.microsoft.com/en-us/windows/win32/msi/roadmap-...:

>Package Validation discusses using Internal Consistency Evaluators (ICEs) to test the internal consistency of installation packages that are under development.

See also => https://docs.flexera.com/adminstudio2021r2/Content/helplibra...:

>The internal consistency evaluators (ICEs) are tests that you can run to check whether Windows Installer packages are valid databases that perform as expected. These tests validate the data in each table of a package, as well as the data among tables.