Upgrading Nokia Lumia 1020 to Windows 10 & Project Astoria questions

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Hi there
If I'm not mistaken, no Nokia Apps will run under Win10M. That includes HERE and the Lumia camera.
The replacement for HERE would then be "cards", for the Lumia camera the Microsoft camera, which does not appeal to you.
You can activate the developer option directly on the phone, you don't need a hack. Ultimately, this won't help you, because the WP8.1 apps are not made for Win10M.
You can easily get back to WP8.1 using the following instructions:
https://www.wpvision.de/windows-phone-ha...anden.html

Thank you for the quick response.
Please tell me how can I activate Developer option on the phone?
But many users reported Lumia Camera woking on Windows 10 (e.g. Lumia Camera for the 1020 returns to the Store, integrates with Photos update ) That's why I would like to try to sideload it, it must work.
Btw, I downloaded Lumia Flash tools from the link you sent me, but it asks for password when I try to extract the zip file.