You are downloading the Gadgeteer XAP file v1.0.0.0 for Windows Phone. Gadgeteer is a free Education App: Gadgeteer is the easiest and fastest way to build small electronic and IoT devices. This app gives you tons of samples, tutorials and more to help you become. You can now download the offline XAP package file to install & try it.
Download Locations for Gadgeteer 1.0.0.0 XAP file
Package File
Please Click Here > to retrieve available package files for Gadgeteer.
Please be aware that the Gadgeteer XAP file you are to download is hosted on the Microsoft Store CDN server. You can read more about Gadgeteer 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 Gadgeteer XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.