If you get a 404 error when trying to access your courses, you may have a permalinks issue. Please try to go under "Settings > Permalinks" in WordPress and just re-save the settings:
If you still see a 404 error when testing a user login and trying to access courses, you may have a missing redirection page. Please checkout our 404 or Critical Error troubleshooting guide for that issue.
If you still can't solve this please reach out to our team for further help.