1) When you select the category then you have to click on filter results to filter the courses. Now all the courses will be filtered and shown to you.
2) I am not able to get you properly on this one, you are using transparent header so the default title background image is shown which is not repeating itself. So please let me know what is repeating on the course page, also share the page url for better understanding.
If you want to change the title background image then let me know.
3) Go to the download page link again, we have added a new direct link for downloading, refer:
http://prntscr.com/bg9z7l