As noted in issue #6910 currently Docker CE does not allow Docker CE to be downloaded without login.
You can find direct links below:
Windows
https://download.docker.com/win/stable/Docker%20for%20Windows%20Installer.exe
Mac
Docker Community Edition 18.06.1-ce-mac73 2018-08-29
https://download.docker.com/mac/stable/26764/Docker.dmg
Docker Community Edition 18.06.0-ce-mac70 2018-07-25
https://download.docker.com/mac/stable/26399/Docker.dmg
Linux
Follow the instructions in the docs: