Angry Birds may be one of the most popular apps of all time, but it’s also not exactly a spring chicken, and so, to boost its downloads, publisher Rovio is now making the original iOS versions for iPhone and iPad free. According to Ouriel Ohayon of Appsfire, who was the first to have spotted this, this is the first time Rovio has taken down the paywall on these versions. The moves come as some have observed that Rovio has of late fallen out of the top 80 highest grossing iPhone apps — for the first time since May 2010.