Nisus Writer Express versions 4.0 and later are compatible with macOS 10.15 Catalina. If you are using Catalina we recommend that you update to the latest version of Nisus Writer Express.
Nisus Writer Express versions 3.x and under are not compatible with Catalina and will not be updated.
Known Issues:
If you are using very old images in the Mac PICT image format (from the days of "classic" OS 9) they will not display on Catalina. For more details see our FAQ topic on PICT images.
Is Nisus Writer Express compatible with macOS 10.15 Catalina?
Moderator: faq-editor