The Apple App Store is designed in such a way that when an update appears for an application, the developers must remove the old application from sale and publish the new one. Unfortunately, updates can sometimes leave users either without the possibility to use the application, or without the possibility of using certain of its functions. Although until now Apple has not published information about a system of iTunes Connect, it seems that developers have the option to offer old versions of applications for download and to provide support for them.
Everything is done by keeping the old application in the iTunes Connect system and by offering users direct download links to the respective application, which is quite complicated, but possible. In practice, you can download an old version of an application from the App Store by accessing a link, but only if the developer has not deleted it from the Apple system. Through this system, developers can offer you updates for old versions of an application, but also the application itself, and availability is especially important in the situation where the new version of an application does not work on a certain old version of iOS.
It has often happened that developers release new applications and do not offer support for old versions of iOS, users are left with the old version of that application, but without many new functions. It's hard to say if developers will want to use this system, available for some time, since the simple update of applications generates sales in the first place, but maybe some will think about users as well.
