Upgrading Nokia Lumia 1020 to Windows 10 & Project Astoria questions

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The apps that you have already installed under WP8.1 can be found in the Store app in the history and can be installed from there, provided that they were still in the store until the end.

I'm afraid it won't be possible to install anything anymore from the Store in case of rolling back to WP8.1 :-( I have just checked again on the phone, and Windows Store is no longer working on WP8.1. As per this article (https://www.windowscentral.com/windows-p...n-december) it has been shut down two weeks ago :-(
That's why I first need to make an image of the current state before proceeding with the upgrade.