Going from Pro to next level up

Hello – Great plugin! Such a big help to those of us that do not know coding very well.It is my answer to having auto feed products that are updated on auto. I had one question: when I go pro and get familiar with it and decide to go up the next level, would I get credit for the amount I spent on the pro? In other words – if I paid $60 for pro and later decided to step up to the $97 for example, would I just pay the difference of approx. $40 to move up? Or would I have to pay the whole $97? (just using these price amounts as an approximate example)

Thanks –
Steve

https://ww.wp.xz.cn/plugins/amazon-auto-links/