I got this when it was free so I have to pay for Audio extraction?

I downloaded this app when it was still free. If I want to use the audio extraction option, will I have to pay for it? 
Also I hope you update soon. I can't download any videos, even if I try to use that technique you said, since the new IOS 8 update. Love the app, though. I am using an iPad, and it works nicely on it too.