Docker has moved its installer behind login and force everyone to give their email id to just install the Docker.
I know that this can feel like a nuisance, but we've made this change to make sure we can improve the Docker for Mac and Windows experience for users moving forward.
As far as I can tell, the docs don't need changes, so I'll close this issue, but feel free to comment.
I'm not sure how this improves the user experience and community isn't really happy with this move but the good news is, the installer file for both Windows and Mac can be directly downloaded.
For Linux (Ubuntu):