Courses will not add to cart

Hi,

I have configured the plugin and when a certain course is added to the cart, I get a pop up offering a second course at a discount. However, when I click on the product, nothing happens. It doesn’t get added to the cart.

When I swap the second course for another product (a print-on-demand sticker), I can click on the sticker in the pop up and it adds it to my cart.

Please can you help me get this working, otherwise I really have no use for the plugin.

Amy