I thought it would be valuable to Mac users to post that there is a free FFT plugin filter for Macs being made available (OSX 10.10.+ on PS CC 2015). Dj Joofa has developed this filter and an early version is available for free if you contact him at email@example.com
I did exactly that and gave the plugin a try. I only have very early results yet so far pretty impressed. I have included a before and after shot of an image of me from many decades ago that has a regular pattern on the scanned print. It removed the pattern quite well and I believe I can also get rid of the edge effect that I see in the result.
Dj Joofa will be also making the plugin available on Joofa's website once it is updated with the new information (if you want to wait for that it will be at djjoofa.com in the downloads section)
Finally some FFT oxygen for the new OS and newer PS for Macs!
FYI - thought Mac users would want to know.
BTW - I am not related to Dj Joofa and get no benefit for sharing this information.
The results are best viewed at 200% magnification to see how well the pattern was removed.