Subcategories price range

[DorianS]

Hello. I am trying to add "subcategories starting price from" on this shop https://srv45778.seohost.com.pl/250-diamenty.

The problem is that the starting price is just the price of cheapest product but from all products listing below (all subcategories products).

I tried to do this (Prices starting from v2): https://nemops.com/product-count-price-ranges-subcategories-prestashop-thirtybees/#.YuqyDXbP2Ul

And this (Prices starting from v1):  

 

Using the solution from link v2 (nemops.com) I was able to show the product count for for each subcategory correctly. 

There must be the way to show the prices correctly as well.

I searched all internet and I did not find the solution for this

Please help me with this.