Re-download macOS Catalina 10.15 Beta

You may be able to download Catalina from the Mac App Store: macOS Catalina Beta Credit to Thomas Nelson for finding the Mac App Store download link.

Go to Apple Developer Downloads and install the macOS Catalina beta profile.

Now on your Mac running a public release of macOS, go to System Preferences → Software Update. You'll get prompted to install macOS Catalina 10.15 beta.

Choose to install it, and it will download the macOS Catalina installer under your /Applications directory.

You have Mac OS Catalina it means you have a developer account or the profile to download the beta of the OS. Use the same profile to download the OS again.

For the first time when you download the profile and when system will check for update, it will give you errors like,

System is up to date. Or No update found.

Just keep on on clicking re try or ok and it will keep on checking again after 2 or 3 times it will start downloading.

Look at image iam running on the latest beta version of Catalina / and still able to download the the same Version .

I also needed to re download the OS as iam about to change my Macs SDD to 1tb and I need to make an offline installer