Update:
I fixed the above problem by installing on an account that is PRIMARY administrator. However, when I go to edit USERGROUP settings, half the settings are MISSING. I get:
DragonByte Tech: vBShop - General Permissions
Is Shop Manager
This controls whether this usergroup can access vBShop via the ModCP (if they have access to the ModCP) and whether they can perform other management actions.
Yes No
Can View Shop
Yes No
Can View Bank
Yes No
I do NOT get the first two settings that are supposed to be in the box (Can Create Custom Shop and Deny By Default):