Valorant Beta installer is publicly available to download but you can’t start playing unless you have a whitelisted account.
After downloading the installer you’ll get access to 6.9Go of game files but you can’t log in just yet.
Valorant is still in closed Beta and you need to have a whitelisted Riot account to start playing.
How to get Valorant beta whitelisted account ?
You need to link your riot account with your twitch account, watch Valorant streams from April 3rd to April 7th, and get a twitch drop that will make your account whitelisted, read more about that in this article.