To build style, go to the folder named "MP2" and run the buildfrontend-styling.cmd script (Not the buildfrontend.cmd script, as it used to be in pre 4.11.0 versions).
Be aware
You must have installed the necessary software requirements for this to work. Look in the styling requirements document for information in how to install this.
Be aware
If the path to buildfrontend-styling.cmd contains spaces, the program will fail.
If everything has been done by the book, the result will look similar to this:
The resulting main.css file, you find in ..\Digizuite Media Manager 4.x.y - include source\MP2\custom-styling\css.
This CSS file you copy into your site's ..\[your site's name]\MP2\dist\app\css folder - before doing this, you may optionally rename the existing main.css file to something like main.css.original, to make sure you have it as backup always.