Alternative (direct from installer):
Method 3: How to Create Your Own macOS Catalina ISO (On a Mac) download macos catalina 10.15 iso and dmg image
Before proceeding with the download, ensure your Mac meets the following minimum hardware requirements: Alternative (direct from installer): Method 3: How to
If you want, I can:
Click the link to open the Mac App Store directly to the Catalina page. Click or the download icon. download macos catalina 10.15 iso and dmg image