Tracking Internal Links? (page to page)

I have a site with a digital product for sale. This is on the main page. I also have about 15 other pages on the site where I display “demos” of this product. Underneath each demo I have a button that links to the pricing table on the main page.

I’d like to track what demo pages people are clicking from so I can determine which of those pages are converting and sending visitors to my purchase page.

I tried to accomplish this by simply adding UTM parameters to those button links expecting that they would show up in Google Analytics. However, after further reading it seems that using UTM links to internal pages could skew my Analytics.

I’m wondering, is this a good use case for Pretty Links? Would the built-in Pretty Links reporting still work as expected?

Thanks for any information or guidance you can provide.