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 a few 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. Registered users will be notified in the near future regarding beta testing. If you must use OS 10.15 (Catalina) or OS 11 (Big Sur), 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 VirtualBox: https://appletoolbox.com/need-to-run-32-bit-apps-on-macos-catalina-use-a-mojave-virtual-machine/

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