A: Answer Hi Winston, Please be informed that the WD My Passport Ultra for Mac drive is a plug and play device tested and designed only for Mac computers for seamless operation.Unfortunately, we cannot provide an exact date as to when the version of WD Discovery that supports macOS 10.15 Catalina will be released and available for download. We are working to release a new version of WD Discovery that will support macOS 10.15. WD Discovery version 3.4.89 does not support macOS 10.15 Catalina.