Unable to find license key tab

Hello,

I just bought the premium version of Custom Product Addons and followed this page step by step: https://acowebs.com/guideline/plugin-docs-faqs/wcpa/license-key-activation/#:~:text=After%20copying%2C%20go%20to%20Settings,on%20the%20Activate%20License%20button.

However, the left bar where options like ‘display settings, contents settings etc’ but also License key are situated is completely non-existent. I’d love to enter the license key but this way I’m unable to.

I already have a fair bit of settings entered in the free version of this addon so I’m not too fond of removing it to see if that fixes the problem. I hope that someone here can help me out instead.

Thanks alot!

The page I need help with: [log in to see the link]