1 - Go to download page of TwoNav: http://www.twonav.com/en/support/downloads
2 - You only have to download 'Land Mac' or 'Air Mac' at 'Mac' section.
3 - Once the file is downloaded, find 'Land' or 'Air' file at 'Downloads' folder...
>> If you double-click on the file, 'Land' or 'Air' application will be run but not installed on your Mac.
>> If you want to install the application just drag 'Land' or 'Air' application from 'Downloads' folder to 'Applications' folder. At this point, the application will be fully installed on your device.
Note: In order to automatically install products with TwoNav Downloader (www.myTwoNav.com), your 'Land' or 'Air' application must be fully installed (second point). If not, TwoNav Downloader will not detect 'Land' or 'Air'.
1 - If you want to uninstall the application just drag 'Land' or 'Air' application from 'Applications' folder to the bin.
2 - At this point, the application will be fully uninstalled from your device.