How to get Imperial? (The Elder Scrolls Online)

Look in the furniture store or in the shop steam, can't remember where.

now I can talk to wait until the shop will not appear the Imperial edition of the game

Vnutriigrovoy in the store you can buy upgrade to Imperial edition

The Imperial is only in the Imperial edition, no more way not to (maybe someday will be released edition, which included everything, but no). And as already wrote above, the in-game store to buy upgrades (for 2100 crowns if I'm not mistaken). I would advise you to take a subscription for a couple of months to received crowns to upgrade to Imperial edition and in addition to all the extras on these a couple of months.