You are downloading the Device Hub AppX file v4.4.1609.2000 for Windows Phone. Device Hub is a free and useful Productivity app: Get more out of your accessories with Microsoft Gadgets. Gadgets keeps track of where and when you last connected your smart accessories so ... You can now download the offline AppX file to install & try it.
Download Locations for Device Hub 4.4.1609.2000 AppX file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Device Hub AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.