Heyall,
So first i'm on KDE 4 with Debian 8 Jessie.
When i try to install a new theme, i get the installer stuck on "initializing" phase ( pic : http://imgur.com/a/u9Sdw ).
Then i searched a bit on google and found first this : https://store.kde.org/p/1002674/

Instructions for Debian and Kubuntu (probably works for other distros too)
Extract FlatSquare.tar.gz
Copy folders to /home/.kde/share/apps/aurorae/themes
Then go to System Settings>Workspace appearance and choose you favourite theme.

i did like it's said , placed all in the folder ~/.kde/share/apps/aurorae/themes , when i type ls here's the result:

FlatSquare next-aurorae Yosemite

However the themes doesnt appear in the window manager :
http://imgur.com/a/u9Sdw
Any idea?

Browsing to the https://store.kde.org/p/1002674/ and downloading the 166579-FlatSquare.tar.gz.

Unpacking the 166579-FlatSquare.tar.gz

Copying the FlatSquare-Amber, FlatSquare-Blue, etc sub folders to the ~/.kde/share/apps/aurorae/themes/.



KDE System Settings > Workspace Appearance > Window Decorations


Full image: http://imgur.com/dvUrZaw

Picking a window decoration and clicking 'Apply'.
Seems to work at here.

Rog131 wrote:Browsing to the https://store.kde.org/p/1002674/ and downloading the 166579-FlatSquare.tar.gz.

Unpacking the 166579-FlatSquare.tar.gz

Copying the FlatSquare-Amber, FlatSquare-Blue, etc sub folders to the ~/.kde/share/apps/aurorae/themes/.



KDE System Settings > Workspace Appearance > Window Decorations


Full image: http://imgur.com/dvUrZaw

Picking a window decoration and clicking 'Apply'.
Seems to work at here.

Thanks for your response mate, i just seen in the FlatSquare folder there was multiple folders inside.
So i copied all of them at /home/master/.kde/share/apps/aurorae/ , but with no result, nothing appears.
In fact i prefer to have the next-aurorae theme or the yosemite.
Any idea?