Welcome to the community! Thank you for letting us know. I'm really sorry you're having this issue. The 404 errors you’re seeing on the Change Speed and Reverse Video tool links definitely aren’t expected, and we’d love to help get this sorted for you.
Just to better understand and assist you further, could you please share a bit more about how you're accessing these tools? For example:
Are you trying to use these tools as part of a project you're currently editing?
If not, how are you trying to access these tools?
Is this happening on desktop or mobile?
This info will help us pinpoint the issue more accurately and get it resolved quicker.