Slideshow doesn't work in Lightroom 6 after updating to macOS Catalina

Maybe: https://community.adobe.com/t5/lightroom-classic/import-error-connecting-to-dynamic-link-server-failed/td-p/5163531

Hi there,

We are sorry about the experience with Lightroom. Lightroom 6 has known compatibility issues with macOS Catalina. Please check: https://helpx.adobe.com/in/lightroom-classic/kb/macos-catalina-compatibility.html#ArelegacyorperpetualversionsofLightroomClassiccompatiblewithmacOSCatalina

You can add Lightroom to the Accessibility list for macOS by going to the System Preferences, then Security and Pirvacy, then selecting the Privacy tab. Also grant permissions to Lightroom under the files and Folders list, and under Full disk access. Once done, please restart the computer to check if that helps.

Regards,

Nikunj