Acquire, give it away.
Big G is giving away both Windows and Mac version of the entire Nik Collection suite! According to Google on their latest Google+ post:
Starting March 24, 2016, the latest Nik Collection will be freely available to download: Analog Efex Pro, Color Efex Pro, Silver Efex Pro, Viveza, HDR Efex Pro, Sharpener Pro and Dfine. If you purchased the Nik Collection in 2016, you will receive a full refund, which we’ll automatically issue back to you in the coming days.