- Click the Finder icon in the Dock, then click Applications in the Finder sidebar.
- Double-click ONLYOFFICE in the Applications folder.
When the app is launched for the first time, it will be verified and you will be asked if you're sure you want to open it. Click the Open button in the warning window to run the application.
In future, you will be able to open the app by double-clicking it in the Applications folder without appearing any warnings. It’s also possible to run the app using the ONLYOFFICE icon in the Dock.