Rather than premium, ShoutMeLoud’s theme is a customized theme. Which means it is theme designed by @denharsh himself by hiring someone or something like that. So, you cannot get it anywhere (unless harsh gives it you) although you want to buy.
Now, the question comes about if you could download premium wordpress themes for free or not. And answers is yes but no. Don’t be confused, what I mean is you can get premium wordpress themes for free in Nulled themes websites but they are full of malicious code (virus) which will completely damage your site. So, instead of using premium themes for free (nulled themes) use free themes or buy a premium theme.
I would recommend you to buy a premium theme because they come with every thing good (good design, good support, good performance, good security etc). It might cost you a little at beginning but will turn into great investment for your site in future.
Incase you want some suggestion about premium themes, I would sugges Genesis and Schema for normal blogs and Newspaper for tech websites. Other is all upon you hands. I hope I tried to answer your question, but still if you’ve a question you can ask.