Upgrading Nokia Lumia 1020 to Windows 10 & Project Astoria questions

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1) You should be able to download the App from the Store, but you require the right link: https://www.microsoft.com/en-us/p/lumia-...zdncrfhww1
2) No need for unlocking to sideload stuff, but you figured that already out.
3) Yes Here Drive+ and Here Maps are no longer compatible, but Voice Direction is still very much supported in the Windows 10 Maps App. If you really need a better Windows 10 Maps App you might want to upgrade to 14393 aka Windows 10 Mobile Version 1607. That said though: There are modified / old version of Here Drive+ and Maps that do still work on Windows 10 Mobile. I was never interested in them, because for me Windows 10 Maps works great, but there are versions around.

1) I cannot download it directly from the webpage of Microsoft Store, if I press Get button it says 'You own this app.' Even if I uninstall the app it still says 'You own this app' on Microsoft Store web.
3) There is no Croatian voice pack to install, at least I couldn't find it. Do you pehaps know how to install additional language packs for Windows 10 Maps?