This should work for all the Ubuntu, Trisquel, Linux Mint, Fedora, OpenSUSE, PCLinuxOS, Redhat Enterprise Linux, Mageia, Debian, ZorinOS users out that amongst others.
I read somewhere that drug stores, grocery stores, and others frequently have devices which allow you to scan slides and photographs. While this might not be practical for people who have thousands of slides it may work for those who don’t have that many.
One last thought. ThinkPenguin.com specializes in providing support for GNU/Linux and it may be worth contacting the company if this specific product disappears form the market. There are probably others out there and/or new versions.