macOS 10.15 Catalina is not yet supported for use with Serato Sample.
We strongly recommend you do NOT upgrade to macOS 10.15 Catalina at this time.
We are currently working to ensure that the Serato Sample plug-in is compatible with all officially supported DAWs.
Please note that Serato Sample operating system support is dictated by the supported DAW that you are using, and its operating system support.
We recommend that you remain on current versions of macOS until further notice.
If you are using Serato Sample with Logic Pro X, please refrain from updating until we give the all clear.
NOTE: It may be worth disabling automatic updates, to avoid potentially clicking the "Install update" button in the macOS pop-up notification, via System Preferences --> App Store --> Automatically check for updates (uncheck).