There are people wondering if it is possible to upgraded to Magento 2 from Magento 1 via admin panel or Magento Connect? The answer is definite: No, it is not possible to update to Magento 2 via admin interface or Connect.
The core reason is crucial difference in code and database between Magento 2 and 1. Therefore, there are data migration tools designed for moving data from 1.x to 2.x. For further information, check this post: Migration to Magento 2.