Answer Chosen by the Author
Not sure how KACE works, but presume it installs stuff as SYSTEM. Use/run psexec.exe -i -s cmd.exe to run a cmd as SYSTEM, so you can test the installer. If you lazy and dont like psexec.exe, you can use PowerRun as an alternative (GUI).
Depending on the installer, if you have logging then enable it, that will inform you of why it failed.