You are downloading the ShareTasks XAP file v220.127.116.11 for Windows Phone. ShareTasks is a free and useful Business app: ShareTask lets you create, edit and complete your SharePoint Online list items in a mobile friendly interface. Log in to a site where the ... You can now download the offline XAP file to install & try it.
Download Locations for ShareTasks 18.104.22.168 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline ShareTasks XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.