Apple just published the latest beta macOS 10.15 Catalina to all developers around the world. So how can you can upgrade if you're not a developer? Is that possible?
Of course yes. Just follow me, I will show you guide how to do it.
First step, you need to install macOSDeveloperBetaAccessUtility to see the beta update, just get from link below:
After finish installing, go to System Preferences -> Software Update to download macOS Catalina
Finish downloading, you will see the following popup:
Just follow those steps and installation is starting. Wait until it finishes then you got the new macOS