Doca Plank Theme
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Three simple steps to install this or other Plank theme
( Note that this only works, if you already had installed Plank! )
Download the Plank theme into your system.
( Usually, I opt for "Downloads" directory )
Unzip the file that you just download to the following location:
Now, press ctrl ( keyboard ) + right click ( mouse ), and it will appear Plank's preferences menu.
Choose the theme of your preference.