It is geared toward v6 of Dorico, latest updates required. There were some things in Dorico, coding wise, that required some changes in order for Cantai to function at its best. So, the best answer is probably: “no it will not work with Dorico Pro 5.”
Cantai is still very much in a development state. So, you could consider upgrading to Dorico Pro 6 whenever convenient. Then you could keep track of some of the Cantai-specific posts here to determine when you want to invest in that sound library.
These three threads probably provide the best overall picture of Cantai at the given moment. If you haven’t yet read through the entirety of the threads, I recommend taking the time to at least skim through them.
