Under admin >>> catalog >>> product types
You will see the standard offerings of product types that can be configured in zencart.
Product Types
Product - General
Product - Music
Document - General
Document - Product
Product - Free Shipping
You might be able to achieve what you want by designating those products as either:
Document - General
or
Document - Product.
You can [EDIT] these types to enable or disable "Add to cart"
The first thing to do (in order to TEST this) is to create a NEW category.
After you have created that category, OPEN IT again for EDITING.
Now, you will have an option (at the bottom of the edit screen), to limit the content of that category to a PRODUCT TYPE.
See the input field labelled "Restrict to Product Type"...
Choose the appropriate product type.
Try adding a couple of products... see if it meets your needs.
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