Weight tracker pro plugin doesn’t work

Hi,

I have bought the weight tracker pro plugin because I want to put custom fields. However, there are no custom fields for me to choose from or to adapt. There is nothing.
I only have the basic plugin, whereas I purchased pro and filled in the licence key and had this confirmed.

So I decided to upgrade to pro plus but that also doesn’t make any difference. The plugin simply doesn’t seem to work apart from the very basics (target weight and current weight).

I have of course emailed Yeken, but I cannot go live with my website now. Does anyone have any suggestions what the problem is?