I don't have credit card but want to download without cc.

You can remove payment method from the account by:Change or remove your payment information from your iTunes Store account (Apple ID)

I am not completely clear on what you are saying in that post, but if you are trying to CREATE an Apple ID without a payment method associated, have you followed the instructions in:Create an iTunes Store, App Store, or iBooks Store account without a credit card or other payment method

How to Get Apps From the App Store Without a Credit Card

http://ipadhelp.com/ipad-help/how-to-get-free-apps-from-the-app-store-without-a- credit-card/

Creating an iTunes Store, App Store, iBookstore, and Mac App Store account without a credit card

http://support.apple.com/kb/ht2534

Why can’t I select None when I edit my payment information?

http://support.apple.com/kb/ts5366

If None is not available - On your computer launch iTunes and click “iTunes Store” in the left navigation pane. Click the “down arrow” next to your name at the top right side of the page and click “Account.” Enter your username and password and click “View Account” to log into your account information. Next to your Payment Type, click “Edit.” Select the “None” button and click “Done.” Confirm that your card has been removed by returning to the Apple account information screen. Under Payment Type, it should say that there is no credit card on file.

iTunes Store: Changing your payment information

http://support.apple.com/kb/HT1918

iTunes Store Accepted Forms of Payment

http://support.apple.com/kb/HT5552

 Cheers, Tom 😉