Parallels Update Problem
I’ve had a problem with upgrading Parallels the excellent tool for running VMs in OSX. For some reason that I could not initially spot the install would hang in the preflight check before applying all the files. I also had a similar problem trying to force an uninstall.
To cut a long story short it appears that the install/uninstall scripts try to shut down the InternetSharing and bootpd daemons…..in my case these would simply not die through the current script and I had to intervene manually - the install then ran fine.