We have re-writen FocusTune for 64-bit mode. This should ensure that FocusTune will run under macOS and WIndows for the foreseeable future. The FocusTune 64-bit mode version is planned for release during the December 2019, and will be a paid upgrade. People who have purchased FocusTune within 2019 will be eligible for a free upgade.
As of Nov 12, we can confirm that FocusTune V5 runs under MacOS Catalina. We will continue testing and hopefully release within Dec 2019.