To use the integrated mp3 encoder in
SONAR Artist, SONAR Professional, SONAR Platinum, SONAR X1-X3, SONAR 4-8.5, SONAR Home Studio 4-7, Project5 Version 2, Music Creator 3-7, Guitar Tracks Pro 4, Kinetic , SONAR LE, Music Creator LE, and Project5 LE
all you need to purchase is the
MP3 activation.
The mp3 encoder is for much older Cakewalk products.
FYI, a license to use mp3 in a Cakewalk product is a one time purchase. If you ever purchased the mp3 encoder, mp3 activation program or a Cakewalk product that included an mp3 license such as ProAudio 9, Cakewalk support will supply the current unlock program at no charge.