As you may already know, Apple will soon release macOS Catalina (10.15) sometime in October.
To ensure that all your Positive Grid products work the way they should, we strongly urge you to put upgrading to macOS Catalina on hold for the time being.
It is our goal to add macOS Catalina to our list of compatible operating systems for all our products. In the meantime, please remain with your current macOS version until an official announcement has been made.
Further updates will be provided here when available.