Ok, I solved it…
I had already selected “latest post” to be in the front page, but just in case of I turn that option off and then on again and… tadaaan… it’s working…
I did both, installed it via the usual, old UNIX way (unzipped in the wp-content/themes folder) and via the web interface.
The theme is active, and what I see in appearance, themes, is Active Zerif Lite.
When I get to “customize”, I see this
http://s30.postimg.org/9ine2di5d/Screenshot_7.png
Why don’t I even see the background? Check this one out:
http://s9.postimg.org/7tzrcdtun/Screenshot_8.png