installable is set to true, but the version is indeed 8. Does that need to be increased? { 'name': 'Rental', 'version': '8.0.0.1.0', 'category': 'Sales Management', 'license': 'AGPL-3', 'summary': 'Manage Rental of Products', 'author': 'Akretion', 'website': 'http://www.akretion.com', 'depends': ['sale_start_end_dates', 'stock'], 'data': [ 'sale_view.xml', 'stock_view.xml', 'rental_view.xml', 'rental_data.xml', 'wizard/create_rental_product_view.xml', 'product_view.xml', 'security/ir.model.access.csv', ], 'demo': ['rental_demo.xml'], 'installable': True, }

Also, any help on the directory or the lack of the Modules section under Settings, which includes Local Modules?

This is because the module depends on several other modules which are set to "uninstallable" too.

What you try to do here needs serious Odoo developing knowledge. If you have that knowledge, then you know the answer to your questions yourself. If not, I recommend you to refrain from such activities.