It has come to my attention that Daily Software Giveaway has run into issues with their latest Giveaway ArcSoft Photo Studio. The problem encountered is where you try to use the coupon as indicated in the readme file only to be greeted by an error message on the activation page saying the coupons usage limit has been reached.
According to the official Giveaway Page : http://www.dailysoftwaregiveaway.com/2012/04/todays-giveaway-arcsoft-photostudio-6.html Daily Software Giveaway has notified users they are working as fast as they can to get this corrected. However It's not clear when they will clear this up. If I come across any updated information I will post back here.