To find the foldeer of the supporter pack, you need to go to the path where the game is installed inside the steam folder.
The route is similar to the following:
C:\Program Files (x86)\Steam\steamapps\common\Love & Sex Second Base
Once inside the game folder, you will able to see the supporter pack folder, I recommend you to copy and paste it in other folder like the images folder or desktop folder.

And that´s all!!!
If you have the opportunity to buy this supporter pack I recommend it, not only buy images and a song but also support the creator to bring us more content for this game.