You have to buy the AP. You can't use any AP that you've received from free AP. It doesn't matter if you've gotten free AP beforehand, as long as you've never bought and used it on another Aeria game before.
Also, you will get everything as seen in this link here.
As far as I know, the sale won't end but that's up to Aeria (probably the product manager) to decide if it ever changes.