change the login theme in gnome 3.20

[TechnoTux <techno2055 yandex com>]

hi,
i'm trying to install a new login theme from gnome-look.org,
let us say this one for example:https://www.gnome-look.org/p/1170579/

i've followed this tutorial and succeed to change the background of the login page
http://blogs.nologin.es/rickyepoderi/index.php?url=archives/119-Customizing-gnome-3.16.html
the tutorial states to decompile the gresource file at /usr/share/gnome-shell/gnome-shell-theme.gresource
then add an xml file with the <gresources> tag and all the other files in the new theme dir in a <file> 
tag,,, i was able to change the background

but my question is how to install this login themes from https://www.gnome-look.org/p/1170579/
i'm using gnome 3.20.2