You have two ways to join this campaign:
1.) Buy CTA3 Pro bundle, or CTA3 Pipeline bundle, to get CTA4 Pro or Pipeline for free.
Time: From now until CTA4 releases in April 2019.
2.) Buy content packs in the Content store with an amount over $299, to get a
free CTA4 Pipeline.
Time: From Dec. 1st to Dec. 31st, 2018