Steinberg actually recommend using SX/SL to transfer earlier projects (Cubase VST) to the new cpr format for opening in C4/5 & 6 is basically the same so while there are no guarantees they should open OK.
Steinberg actually recommend using SX/SL to transfer earlier projects (Cubase VST) to the new cpr format for opening in C4/5 & 6 is basically the same so while there are no guarantees they should open OK.