Windows
Download the CellsSync MSI and execute it on your computer. It installs CellsSync as a windows application. For the time being, the local service is not automatically restarted at reboot.
MacOSX
Download the CellsSync DMG and execute it. Drag and drop CellsSync in the Applications folder, then launch it. The very first launch will alert about the file coming from the internet, in some cases you may have to launch it again after approving this alert.
Depending on your security config, MacOS might require additional permissions; System Preferences > Security & Privacy > Files and Folders and allow access.
Linux
There is currently no installer for Linux, just download the CellsSync Binary and run it with ./cells-sync start command.
Depending on distributions, the UX components might require additional packages, such as sudo apt install libappindicator3-1.