Just log into your Google Play account and be sure to click the orange “Free” button at the top of the page.
Please note: you will have to enter a payment method at checkout, however you will not be charged. Click on the “Free” button at the top of the page, not on the individual songs, or you will be charged $1.29 for those. Also, I’d recommend removing your credit/debit card from the site once you’ve downloaded the album just to make sure you don’t incur charges in the future.
Thanks, My Frugal Adventures!