Mac users on current hardware must look for 64-bit alternatives like SysEx Librarian Windows 10:

If you are using and need help with specific transfer issues , C6 now completely removed from Elektron.se - Elektronauts

C6 would still work for basic .syx file sending/receiving , but for modern devices with bidirectional patch editing, it was already considered legacy.

software. While it remains functional on older operating systems, modern computer updates—specifically Apple's transition away from 32-bit apps—have rendered it incompatible with most current setups. Compatibility & The "Catalina" Wall