The fre:ac v1.1 Alpha 20190423a hotfix has been released to add support for macOS 10.15 Catalina.

In previous releases up to 20190423 it's not possible to select any files or folders in file open/save dialogs. It looks like this is caused by a broken open/save panel programming interface in macOS Catalina. Chances are that this will be fixed in a future macOS update. In the meantime, the 20190423a hotfix implements a work-around for this incompatibility.

The update is available in the downloads section.