Unable to find my themes in Gnome-Tweak

hi all ,
rying to install a theme in fedora (31)for the first time , i did not have .themes folder in /usr , i created it . downloaded the themes zip file. gnome tweak is not much use , its not detecting the theme in the list. how to install this theme now ?
theme name is Redstone , its a windows theme for fedora (GTK +3)

The folder you mean is /usr/share/themes and exists already. Try to put it there. Then it should work