Remove the 8GB temporary file to free up space:
After downloading, the "Install macOS Catalina.app" file will be located in your folder. Do not run it – if you run it, it will try to install Catalina over your current OS. Close the installer window. Download Macos Catalina Iso File
Click or Download . Once finished, the file "Install macOS Catalina.app" will be in your Applications folder . Step 2: Prepare a Temporary Disk Image Remove the 8GB temporary file to free up
You can find copies like the macOS Catalina 10.15.5 ISO or the 10.15.7 version on the Internet Archive . Download Macos Catalina Iso File