Mac OS X Mojave How Is Working ? What's New ? And Download ?

Download Mac OS X Mojave :
Once you know your device is compatible, you're good to get started. Here are the steps to install the macOS Mojave beta:

Go to beta.apple.com and sign up for the Apple Beta Software Program. Note: You'll need to have a developer account.
Once you're logged in you should see a Mac tab on the beta website. Click on that.
A button on the Mac tab should say "Download macOS Mojave beta." Start the download and let it complete.
Plug in your device to a power source.
Once the download completes the update file should open automatically in the macOS store. If it doesn't double click on it and it should open.
Follow the prompts after the installation to restart your machine and you'll be all ready to give Mojave a test drive.
Before installing macOS Mojave on a device, keep in mind that the beta isn't finished, and it still has bugs. So, don't install it on a device that you use to get work done; instead, install it on a test device or an older device.