We keep a 32 bit binary of Modul8 v3 for legacy features like Freeframe and for 32-bit-only drivers compatibility. We have no plan to add support for newer Freeframe versions in version 3.
freeframe plugins are not 64bits compatible. You can open Modul8 in 32 bits version by changing the settings of Modul8.app(cmd-i on the app -> open in 32 bits mode).