It is possible that this question is not correct in this thread, because it leaves a little of the initial theme of the thread, but as you two have advised me that topic and use it, I turn to you to see if I clarify any doubt:
I have been looking at the theme that you indicate, in principle I am looking for a responsive theme for the mobile version of my forum, responsive to be compatible with the plugins I have, work well (the mobile by default theme does not work very well) and be something "light" to favor the load. In principle, my main theme desktop version would leave it, it is not responsive, but it is very nice to look at and I have it modified to my liking and users like it a lot, the intention is not to change it, or failing that, the theme that bought (responsive or not) would adapt it to the colors I currently have, that could do it, but not the footer, I would not know how to put it in a new theme.
Having said all this (which I extend) I have seen the theme that you are commenting on, I have contacted the author to resolve any questions but I do not get an answer, so I turn to you a little. Would it be feasible to install it only for mobile version?
I have also seen this, which is responsive:
https://www.sultantheme.com/product/st-vb4-responsive/
It is much more expensive, and for the desktop version I should adapt the colors like the current one I have or just use it in mobile version.
And at this moment ... I don't know if I opt for the responsive theme for desktop and mobile or the theme metro (and I doubt if only for mobile or also as main) ...
I am a sea of doubts ... :-P