Here is what the official policy says:
Your goal is not to collect course files. Your goal is to become an employable Odoo consultant . Invest in the learning process, not the file hoarding process. Happy learning (legally). udemy odoo course download
For an Odoo beginner, the time saved by using a legal course far outweighs the $12 price tag. The two weeks you might waste debugging an old, pirated version of Odoo code will cost you more in lost freelance income than the course price. Here is what the official policy says: Your