Browse to the following location on the xp-pen site and search for Deco 01 V2
https://www.xp-pen.com/download/index.html
Download the BETA driver XP-PEN_3.0.5.201126-1.x86_64(New UI Beta Driver)
Extract the downloaded file and open terminal staying within that folder and run sudo ./install.sh
This should install the application to your usr/lib/pentablet folder. Even though it successfully installs you might not be able to use it as there seems to be a bug in the installation.
But there is a work around. Navigate to your usr/lib/pentablet open terminal from within that folder and run the following
sudo CHMOD +x ./pentablet
Once thats done. Navigate to usr/share/applications and open terminal from within that folder. In terminal type the following sudo gedit ./xppentablet.desktop
Change the following lines
FROM
Exec=/usr/lib/pentablet/pentablet.sh
TO
Exec=/usr/lib/pentablet/pentablet
Save and exit.
You should now see your pentable application available in the launcher