You are downloading the Lumia storage check beta XAP file v18.104.22.168 for Windows Phone. Lumia storage check beta is a free Productivity App: Get this app to visualize the use of phone storage and to free up space by clearing some temporary files. Note that this is a beta version of the. You can now download the offline XAP package file to install & try it.
Download Locations for Lumia storage check beta 22.214.171.124 XAP file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Lumia storage check beta XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.