I recently acquired a Pakon F-135 35mm negative scanner. It's an ancient but wonderful way to quickly scan 35mm film without a flatbed scanner. Before I bought it, I searched around the internet for the installation software. All the information I saw recommended joining Facebook and asking the Pakon F-135 group on there for it. Facebook sucks so that wasn't an option for me.
You can download a copy of the software and some helpful mods here:
https://github.com/plonsker/pakon-scanning-software/archive/refs/heads/master.zip
The repo is https://github.com/plonsker/pakon-scanning-software