Start with the base game
Rocket League combines driving with team-based ball play. Use the official Play page to choose your platform. An old article mentioning Revenge of the Battle-Cars should not be read as a separate modern base-game installer.
Check platform and account details
Follow the publisher’s platform route and review any account-linking instructions before creating a second account or changing an existing one. If you have older purchases, look at the publisher’s current guidance for that platform rather than assuming an archived add-on offer is still sold in the same form.
A useful first session
Learn basic steering, camera controls and ball contact before spending time on cosmetic choices. Change one control option at a time so you can judge its effect. Current prices, promotions and add-on availability belong to the store, not to this historical URL.