Hi Ivey,
Sorry you're having trouble.
I went to the product page and verified that the
video file plays as intended.
Can you try another browser?
Can you try another device?
Can you make sure your internet connection is robust
enough to stream video elsewhere?
Also,
https://help.gumroad.com/ might be more equipped to help you with this issue, since the problem seems to be that you can't access the content on their platform, but we will try to help you get it sorted as best we are able!