You are downloading the Firmware Update Check XAP file v126.96.36.199 for Windows Phone. Firmware Update Check is a free and useful Productivity app: Is your device up to date? Is eligible for Windows 10 Mobile? How to get firmware updates? You'll find everything you need with this ... You can now download the offline XAP file to install & try it.
Download Locations for Firmware Update Check 188.8.131.52 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Firmware Update Check XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.