You are downloading the Simple Screen Locker AppXBundle file v2015.811.2214.0 for Windows Phone. Simple Screen Locker is a free and useful Productivity app: Do you want to lock your screen but don't want to stretch your finger and reach the lock button? Just pin a tile to your Start Screen!And ... You can now download the offline AppXBundle file to install & try it.
Download Locations for Simple Screen Locker 2015.811.2214.0 AppXBundle file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Simple Screen Locker AppXBundle file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.