macOS 10.15 Catalina is currently in BETA, and is not yet supported for use with Serato Sample.
We strongly recommend you do not update at this point
We are currently testing the plug-in against BETA builds of macOS 10.15 Catalina.
It's also worth noting that Serato Sample operating system support is dictated by the supported DAW that are you using, and it's operating system support.
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)