I compared the 2 executables properties under the Security tab. The authentic script from the Adobe website identified the Group or username as "SYSTEM" while the script that downloaded from the software already installed on my computer identified the Group or username as a series of numbers and dashes ((as an aside, I just downloaded a CCleaner update after a prompt from the installed version on my computer, and it too identified the Group with a similar series of numbers and dashes. Before installing it, I went to CCleaner and downloaded the latest version to compare, and noted that the Group was identified as "SYSTEM." - everything else about the 2 files was identical. It appears that there may be a difference in group properties when you download a file update using installed software versus download directly from the website itself. ))