You do no need to take this program with your ex-partner at all.
While it would be ideal for our partners to do this inner work at the same time, this is not typical. Generally most individuals take this program alone, and regardless of this, they see massive results in their ability to communicate with their partner (and ex partners).
Your energy is contagious, so when you shift yours, you shift the relationships in your life - including the one with your ex as a coparent!
What we've seen hundreds of times: it takes two to tango, but only one to lead!