'If you are in a Free Trial period - If you would still like to cancel, you can do so now by logging into your account, clicking on "My Account" in the top-left corner, and selecting "Account Status". Simply click on the "Cancel Free Trial" link at the bottom of the pop-up and follow the prompts to cancel your trial subscription. Once you cancel your Free Trial you will be downgraded to Napster Light. Napster Light is a free music store and there are no subscription fees. You can use Napster Light moving forward to purchase tracks and albums, burn, and transfer tracks.'
It is in their FAQ's click here I would suggest that you read them carefully to see what you are signing up for...and no, you cannot download tracks unless you pay...you can download 30second snippets for a trial listen.