After you have installed the base Oats Studios - Volume 1 Assets product in your Software Library, you will have a set of optional DLC that you can choose to install from that same page including scripts, concept art, 3D models and high resolution videos.
We've made these DLC optional as the total package is already over 12GBs in size and we want to make it easy for you to install exactly what you care about.
So look for the following DLC section in your Library and install away!