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<blockquote data-quote="IWT" data-source="post: 1836481" data-attributes="member: 83420">No, of course you wouldn't be likely to have a big problem when going up to macOS Mojave - apart from anything else, you probably had more free storage space then.&nbsp; But moving on to macOS Catalina, as Jake and I (and others) have said, requires a great deal more free space.OK, so you simply want to make a bootable USB Installer for Catalina - well, as I pointed out, way back in post #4, you need to download macOS Catalina first, then halt the installation process and use Apple's method or Diskmaker X to create the Installer.If Apple determines that you have not enough free space to install macOS Catalina, it will probably disallow the download for your own sake.However you look at things, 27GB of free space is insufficient for running any modern Operating System (OS) and well nigh impossible for Catalina.So, the main issue still stands - you need to offload at least another 70GB or more to run any OS optimally and even more so if you intend to download macOS Catalina - which is the only way of creating your Installer.Finally, if macOS Catalina is your final aim (why else would you want to create an Installer) - then 4GB of RAM is going to slow things dramatically.&nbsp; Your Mac can take 8GB of RAM.Ian</blockquote>

[QUOTE="IWT, post: 1836481, member: 83420"] No, of course you wouldn't be likely to have a big problem when going up to macOS Mojave - apart from anything else, you probably had more free storage space then. But moving on to macOS Catalina, as Jake and I (and others) have said, requires a great deal more free space. OK, so you simply want to make a bootable USB Installer for Catalina - well, as I pointed out, way back in post #4, you need to download macOS Catalina first, then halt the installation process and use Apple's method or Diskmaker X to create the Installer. If Apple determines that you have not enough free space to install macOS Catalina, it will probably disallow the download for your own sake. However you look at things, 27GB of free space is insufficient for running any modern Operating System (OS) and well nigh impossible for Catalina. So, the main issue still stands - you need to offload at least another 70GB or more to run any OS optimally and even more so if you intend to download macOS Catalina - which is the only way of creating your Installer. Finally, if macOS Catalina is your final aim (why else would you want to create an Installer) - then 4GB of RAM is going to slow things dramatically. Your Mac can take 8GB of RAM. Ian [/QUOTE]

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