Ok, but I don't want to uninstall the game only to just revoke the license.
I'd help anyone with a Hamtaro avatar. So in short: call the Divinity2.exe with the argument /revoke
Longer explanation:
You can do this from the command prompt or by creating a shortcut to the exe.
1. Shortcut
a) Go to the directory you installed the game in.
b) Right click the Divinity2.exe (it is in the bin folder of your installation folder).
c) Choose "Create Shortcut".
d) There should now be a shortcut in the bin folder called "Shortcut to Divinity2".
e) Right click that shortcut file and choose properties.
f) In the Shortcut tab of the properties window, add /revoke to the text string that is in the Target field.
E.g. Target: "C:\Program files\Divinity 2\bin\Divinity2.exe" /revoke
2. Command prompt
a) Find out where you installed the game and copy that path.
b) Click the Windows Start button and click Run (or press Windows+R)
c) Type cmd
d) Hit ENTER or click OK
e) An oldschool DOS kind of thing will open.
f) Use the cd command to find your way to where you installed the game or type this:
cd "C:\program files\divinity II - DKS\bin"
(Replace "C:\program files\divinity II - DKS\bin" with the path you installed the game to if you changed it during installation. Make sure to keep the double quotes there if you have spaces in any folder name of the path.)
g) Type divinity2.exe /revoke
h) Hit ENTER