How to download prince of persia sand of time full game in my pc?

You can buy and download Prince of Persia: The Sands of Time on Steam for $9.99 USD.

First make an account, if you don't have one already, on steam by clicking login at the top of the page.
Then Just scroll down and click the "Install Steam Now" button.
Download the installer.
Install steam.
Open steam.
Login.
Search for Prince of Persia: The Sands of Time.
Click on it.
Click purchase for myself or purchase as a gift.
Put in your payment method and information.
Continue.
Review and purchase.
Download and enjoy.

Hope this helps.