Hi OlegOlle,
You can fix the problem with the downloads by following these steps below
First, add something to your download queue from the
web marketplace. Then, sign in to the console that you want to make your main console
and navigate to active downloads (press the guide button
-> Marketplace -> Active Downloads.) When you see the above screen shot showing the item you added to your queue assigned to another console, simply
select it and press A. From here Select Download All Items.
Once you do that, your download will begin, but more importantly choosing Download All Items tells the Xbox LIVE service to make the console you are currently signed in to LIVE with your main console.
You can have your profile on multiple consoles at the same time with out issue but if you want to delete your profile from your old console you can do so by following the steps
HERE
