This struggle is best summarised as an inverse problem, in which one begins with a set of observations (e.g., EEG signals) and has to work backwards to try to calculate what caused them (e.g., neural activity in a specific brain region).
Application Loader is a tool provided by Apple which allows you to upload new binaries and deliver new in-app purchases to iTunes Connect. You can download and install Application loader from iTunes Connect. Installing Application Loader . Log in to iTunes Connect. Click on Resources and Help. Scroll to App Preparation and Delivery. Click the Download Application Loader link to download the self-extracting installation package (ApplicationLoader_X.X.dmg).
You can download Application Loader from Itunes Connect. Go to https://itunesconnect.apple.com/, sign in, and click on Manage Your Apps. There is a Download Application Loader link at the bottom. At the time of writing, this link is: https://itunesconnect.apple.com/apploader/ApplicationLoader_3.1.dmg