I have just downloaded a trial of Photoshop Elements 15, but it does not see my Canon CanoScan 8800F scanner when I go into Import. I am using a Apple Macbook Pro OS X Yosemite version 10.10.5. I have tried using two different USB ports to connect the scanner, but it still cannot see the scanner. The scanner is otherwise working fine if I use the software that came with it. Does this mean that it is not compatible?
Your scanner probably needs the legacy TWAIN plug-in. It was possible to run this with 32 bit versions but as far as I know there is not a TWAIN version for 64 bit Windows and PSE15 is only available as a 64 bit application.
You could check with Canon to see if the WIA driver is available.
Alternatively use the scanner software and import into PSE using:
File >> Get Photos & Videos >> From Files & Folders
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