The newest version of the Gobbler app, compatible with OS X 10.13 (High Sierra) to OS X 10.15 (Catalina), is now available.
You can download the installer here: Catalina-compatible Gobbler app 2.2.4. Build 545
The Legacy version of the app, that runs on OS X 10.9 (Mavericks) to OS X 10.12 (Sierra) is still available here: Legacy Gobbler app 2.2.3. Build 538
The Gobbler team