Hello, my colleagues!

At first: sorry for my non-professional vocabulary. This is the first time when I face this problem and specialists in this field.
My story in a few words: I am a dentist. We purchased a machine for milling crowns and bridges Wieland 4030 (as I understand built on the basis of ISEL 4030, 4 axis) When we got it, we realized that there was a problem with connecting. After many attempts, we sent to a repair center where it was accepted the decision to replace the old controller and servo drives with new ones. After the upgrade, we got a machine that is fully driven by MACH 3, but now we are in search of a program that can generate for the Mach3 CNC file.

I install on my computer PowerMill 2017, but I have no idea how to connect it with my CNC.

As well, I have downloaded the dentist version of PowerMill DentMill (the project had been closed in 2015).

The main task is to mill crowns and bridges in 4 axes with an auto-change tool(we used 3 milling burs). We simulate crowns in the CAD program, and then we get an STL file. After that, it needs to be milled.
I attach a photo of the machine to the post.

I ask your advice in this case. For any information and direction I will be very grateful. You are my last hope. Thanks!