Hello @mateusfir,
Thank you for contacting Themeum support. I hope you are doing well.
You can enable “Guest Mode” from Tutor settings > monetization tab then enable “account creation during checkout” from woocommerce settings > accounts & privacy tab- this shall allow users to navigate to checkout page without logging in or creating an account but they need to create a username during checkout to ensure enrollment into courses. Make sure you have “Course Viability” feature disabled from Tutor settings > course tab.