I am trying to update a work computer to Catalina from High Sierra. However, the the system is telling me I still need 1.5 GB of space out of 30GB and I have cleared everything except for 500 MB of applications (470 MB of which is Chrome) and 18 GB of system files. My trash is cleared, temp files gone, everything. I'm at a loss of what I can do to update at this point. How are 30GB macbook pros even supposed to update if Catalina is going to take 12 GB of free space and the previous OS 18?