Can't receive help from sellers as I do not know what purchase code to present to them


I do not know where met licences go when I download something with a licence, I;ve downloaded a Wordpress theme and I need help from the developers of it. please help.


That is the price of using Elements - support is not included. More info:

Take a look on part “What’s not included with your item”.

If you need support from developer, you will need to buy a theme from ThemeForest market (from authors profile on ThemeForest) and you will get purchase code and 6 month of support (if the support is included with theme - you must check that part also).