Since July 1st 2020 sale and development of GogTasks for Outlook has been halted. You can for the time being still use your existing installation or download the latest version here if you already have a license. Note however that GogTasks is dependent on the Google Tasks service and any future breaking technology or license changes may break GogTasks for Outlook.
Download GogTasks 6.3.6 for Outlook 2010/2013/2016