Declaration of code quality Bootstrap v4

You declare on the page that the code is written in bootstrap v4 but as I watch html and v4 it certainly is not.

I can see it has used Bootstrap v4.1.0
you can check the css here:

Yes, but html code with classes is from v3. pull-right, left, p-b-20 … are not used in bootstrap v4

you can ask this direct to the item author going through item Commnets page and post your query. item author will reply and answer you.

I don’t buy it from the author, but from envato

no problem. you can ask them your query.
How to contact an author: