You are downloading the Swift Launcher APPX file v188.8.131.52 for Windows Phone. Swift Launcher is a free and useful Productivity app: Swift Launcher makes your most frequently used apps and settings available right in the action center (notification center), so that you can access ... You can now download the offline APPX file to install & try it.
Download Locations for Swift Launcher 184.108.40.206 APPX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline APPX 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 Swift Launcher APPX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.