If you maintain vintage gear in 2021, keep C6 on a USB stick. It’s abandonware, but legendary abandonware – like a trusty soldering iron for your patches.
: Elektron stopped developing C6 because it is a 32-bit application , which makes it incompatible with macOS 10.15 (Catalina) and all subsequent versions. c6 sysex manager 2021
Generally works on Windows 10/11, though some users report MIDI driver issues with modern interfaces. If you maintain vintage gear in 2021, keep C6 on a USB stick