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KaleidaGraph is currently still a 32-bit application and will not run under Mac OS 10.15. A 64-bit version is under development, although it will not be released before Catalina and we do not have a release date at this time. We will notify registered users as soon as a beta version is ready for testing.

KaleidaGraph will still run under Mojave (10.14) and earlier versions of the OS. If you must upgrade to OS 10.15, you would need to use a program like VMWare Fusion or Parallels to install and run an earlier version of the OS as a virtual system.

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