Upgrading Nokia Lumia 1020 to Windows 10 & Project Astoria questions

[nautilus]

0

So far I managed to find three Lumia Camera appx files that were possible to install.
With one of them I get the same 'goodbye' message that the app is no longer to be used and that there is now Windows Camera app instead.
With other two appx after installing I get the message that I should update to Denim software (firmware?) in order to be able to use Lumia Camera app.