Buy a dedicated slide scanner from eBay. If its software is missing/out of date etc., use VueScan (versions for Mac, Windoiws and Linux) which supports most scanners - new & old!.
I use VueScan with my Nikon Coolscan and it's superior to the Nikon software the scanner came with. - I have no connection, other than a very satisfied user.
I've been using Macs & Photoshop for over 20 years now, but I STILL shoot on Fujichrome with my two Nikon F4s bodies and the F801s I picked up for £20 a few months ago...
I bought my Coolscan V new some years ago, and wouldn't part with it.