I did it!
How to play elite if you already have an established elite in Steam or from the frontier website.
1. Launch the launcher of the installed game. In the launcher, select - Exit on this computer
2. If you entered the browser on your computer under your account and remember the password, then log out on the site too
3. Now start the game at Epics. If you did everything correctly, you will be prompted to create an account and link the game.
There is one nuance here. If you bought a game on the incentive or on the frontier website to some e-mail, and the same e-mail is in the epic launcher, then there may be binding problems! Because the game is not linked to an account, but to an e-mail!
Try to have a different e-mail in the epic launcher
4. The game bought in Epic store - can only be launched from the Epic launcher. Otherwise, it will not work.
5. In order not to keep a bunch of installed games on your computer - you can enter your old account through the launcher launched through Epic. Just log out and log in with your old account.
The main thing is not to check the box to remember the password! Otherwise, you will not be able to enter the epics account later until you log out