i can't get free software from Apple store

What happens when you try to download them ? If you are getting an error message then what does it say ?

If you are getting a message to review your account and enter payment details then have you done so ? Unless the instructions on this page are followed when creating an account : Create an iTunes Store, App Store, or iBooks Store account without a credit card or other payment method - Apple Suppor…

then you will need to enter payment details before the account can be used - you should be able to remove them after entering them.