You are downloading the Striver XAP file v126.96.36.199 for Windows Phone. Striver is a free and useful Health & Fitness app: This is Striver: a Strava client for windows phone. Strava is a website that lets you log your rides and runs, analyse them and compare them ... You can now download the offline XAP file to install & try it.
Download Locations for Striver 188.8.131.52 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 Striver XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.