1. Open syncmate.dmg
2. Double-click Uninstaller (.pkg file) to launch it:

3. You'll need to go through the installation process of Uninstaller in order to uninstall SyncMate. To achieve it click "Continue" button in the invoked window:

4. Select the destination path for SyncMate Uninstaller, then click "Continue" button:

5. To install SyncMate Uninstaller your administrator password is required. Enter your administrator password in the invoked window and click "OK" to continue.
6. When installation of SyncMate Uninstaller is over, reboot your computer to finish SyncMate uninstallation process.