I keep receiving the following error when attempting to use a policy and the 10.13.5 installer app to upgrade a machine that has 10.13.4 currently. "Unable to unarchive installer. Upgrade of macOS failed" I have tried doing the upgrade with both an install policy and also a policy for caching/installing the upgrade as well. Any suggestions on what could be causing this or how to fix this issue?
Solved! Go to Solution.