I have Odoo 11 community version, I want to update to enterprise. My employer gave me  license key for development purposes. But I don't see how to update my version, all I found is either buy enterprise, option which I don't need or use \Yenthe's script, which fails since there is nothing at ttps://www.github.com/odoo/enterprise
So how can I install enterprise or where from may I download enterprise modules?