I have been using CPN 4 since it was released as I found CPN 3 choking on notebooks that were very large in size. I do have CPN 3 and I could test it out on Mojave but I presume that everyone that has posted here are running CPN 4. I'm still having mixed results with CPN 4 with Mojave because of occasional crashes so I am keeping my main system on Sierra for the foreseeable future. I too have years of ongoing projects that will take so much time and effort to port over to some other app that I cringe too. I really think that CPN 4 needs some small tweaking to run better on Mojave and if there are others here who want to form a strategy for reaching out to Jayson Adams I'm all for that. It's not just that Apple abandons software (which they have done all too often) or forces upgrades but we are in a very mature desktop market and all the heat and light are getting sucked up by ios apps.