I've downloaded the Decent skin. The thread points out that it's for Primo 2.4.
Inside the "readme.txt" file it points that it's for Primo 2.x, so I gave it a try.
I've copied the file "Decent_color_multi_for_P2_4.zip" from the rar file (\content\skin) to the Primo \content\skin folder.
Turning navi on, I got the message:
Failed to open file:
ui_igo9\480_272\ui\brand_params.css.
exiting application.
So I rename the file templates.css --> brand_params.css
Turning navi on, this time it took a bit longer and I got the message:
Failed to open file:
ico_Exit_sml.bmp#3
exiting application.
I couldn't find a file name that is similar to this name, so I went back to my default skin (diMka) :(