How do I find Adobe Flash Player on iMac OS 10.11.6

I repeatedly receive a pop up message on my desktop iMac to uninstall Adobe Flash Player since it no longer is supported by Adobe. A Mac telephone support rep could not help me find that Flash Player file on the Mac Book Pro and was concerned that when I did select to uninstall the Flash Player I was sent to an Adobe website and was instructed to download an uninstall file which she advised me not to download. The Apple support rep then conferred with a supervisor who recommends that the G-drive mini external hard drive backups that I have could be compromised by this issue.

I had purchased a new Mac 24” desktop and was hoping to install data & files from that G-drive mini external hard drive and the support rep recommended that I initially set the new Mac up as a new device and to reinstall my data via iCloud first & then drag, from the G-drive mini external hard drive (omitting the Flash Player) any files or data that are missing from the iCloud data/files.

I have taken photos of the Mac Book Pro data information from System Preferences but am concerned that I will not be able to know what data or files that are not in the iCloud data and that I will therefore not be able to retrieve all data/files in this iCloud/external hard drive transfer.

Thank you for any and all assistance in the issue.