I get a warning that KaleidaGraph is not optimized for my Mac. Will there be a 64-bit version of the software?
Yes. We are currently rewriting the software for a new development platform which will allow us to provide a 64-bit version of KaleidaGraph for both Mac and Windows. There are still several sections of the program that need to be rewritten so it is still too early to provide a release date for a 64-bit version at this time. Once we get closer to beta testing, registered users will be notified by email.
If you must use OS 10.15 (Catalina), we suggest using a program like VMWare Fusion, Parallels, or VirtualBox to install and run an earlier version of the OS as a virtual system which would provide access to 32-bit applications. If you have multiple Macs, you could leave one at an older OS. If you have access to a Windows computer, the Windows version of KaleidaGraph can open your Mac files.
Here are links to settings this up using Parallels Lite and VirtualBox:
Parallels Lite: https://www.imore.com/how-install-macos-vm-run-your-32-bit-apps