You are downloading the Upwork AppX file v1.2.0.3 for Windows Phone. Upwork is a free Business App: Upwork(Formerly oDesk) is reference to "Upwork.com" website. Upwork is a global online work platform where businesses and independent professionals. You can now download the offline AppX package file to install & try it.
Download Locations for Upwork 1.2.0.3 AppX file
Package File
Please Click Here > to retrieve available package files for Upwork.
Please be aware that the Upwork AppX file you are to download is hosted on the Microsoft Store CDN server. You can read more about Upwork or get it on Microsoft Store.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Upwork AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.