Unfortunately, there is no way to safely interrupt the Installer so you will need to manually cancel the process.
It's unclear what may be a contributor, but the most likely causes are interruption due to a virus/security application running. Please refer to the Xerox FreeFlow Core Security Guide for important information regarding Security Protection settings. The guide can be downloaded from the Xerox Security website at: xerox.com/security
...and it is always recommended to perfrom a full system backup prior to perfroming updates and upgrades.
