I am a newly registered user, how do I restore to the old version?

I don’t know this software at all and need to take online paid courses.

After spending money, I found that all online paid courses were old versions.

The new version cannot cope with it,

It is very painful to learn, and it is often difficult to find the objects explained in the video.

Just looking for these buttons takes more time than studying.

But I can’t find a newer version of the course either.

Please help me!

I know that after pressing the question mark in the lower right corner, there is a button to restore the old version, but mine does not. I wonder if it is a problem because I am a new user?

I really need the old version, otherwise I really don’t know how to search for courses online. For someone like me who has no experience at all, the version is different and I can’t learn.