I used a 14 day free trial of your yahoo plus. The trial expired, and now I want to upgrade to Yahoo plus.
Are you aware that your flow blocks this behavior?????
You are driving revenue away:

there is no way for someone who has used a free trial in the past to now purchase Yahoo Plus straightaway--you block it. Go ahead, try it and you'll see...

By forcing the free trial, and simultaneously blocking someone from getting a second free trial--you are blocking people who have used a free trial in the past from purchasing the product without the trial--which you block.

Hurry up, product manager--fix this simple issue, and then take credit for it and get a crazy raise