Unfortunately, you can't download Valorant on PS4 and PS5 as Valorant developers the Riot Games launched it only for PC and it has been a success till its launch.
But you don't need to worry you can download it on your PC:
1. Go to the Valorant official website and click on the Play Free button
2. Then you need to sign in to your Riot account or you can create one.
3. You can download the launcher and install the game.
4. After the download, you will see a shortcut of Valorant on your desktop.
How to Play Valorant on PS4 and PS5?
You cannot play Valorant on PS4 and PS5 as it's not available now for these platforms but Riot Games are working on it so you can have the best experience of Valorant on PS4 and PS5.
It's a five-player match and you need to win 13 rounds. In each round, you need to detonate the explosives or kill each one of your enemies.