command not found

Check the size of the Install macOS Catalina.app it should be 8.17GBs. If it is not this size then it may not have downloaded properly, you will need to move it to the Trash, empty the Trash. Connect your mac to your router via a cabled connection rather than WiFi. Restart your mac, open the App Store at the Catalina page and download again, do not use the mac while it is downloading, if other devices share the same internet connection do not use them either.

Can you double-click on the Install macOS Catalina.app that you have. Does it start the installation procedure, you don't have to go through all the stages you can abort, I just want to see if the app on its own ca launch into the install procedure.

ames294J Said:

"command not found: Hello, I am trying to make a bootable drive for catalina and getting the error below. [...] Error: /Applications/Install macOS Catalina.app does not appear to be a valid OS installer application.[...]"

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A Few Thoughts:

• Create a New Administrator:

Using Users & Groups, in System Preferences, create a new administrator. See if it now works. If so, it is something configured in your current user.

• Use Another Network Connection:

Perhaps something has gotten in the way? I would try either another network or - use a local (AKA Hardwired) connection, connecting your Mac, directly into your router.

• Rid of Security Software:

If you have Security Software installed --- uninstall it. Use an uninstaller from the developer's site. If you just drag it into the trash, caches will reside on your Mac. So, download and uninstall it with the uninstaller. Security Software's settings are getting in the way, most likely USB port inaccessibility settings.

• Be Sure to Use this Link: How to Create a Bootable Installer for macOS - Apple Support

Unless your mounted USB stick is 16 GB, and named MyVolume when mounted on your Desktop, this command sequence will bork looking for --volume /Volumes/MyVolume which does not exist. Whatever the name of the USB stick is when mounted, use that name even if it is Untitled.

From your screenshot you still have the message about changing the default shell to zsh, it gives you a command to do so, but it seems you have not done so, could you try that to see if it makes a difference.

Go back and rename your USB MyVolume and when you are ready copy and paste this command followed by pressing Return.

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

Notice the spelling of MyVolume in the command sequence that failed, and your MYVOLUME device name. This should not matter in a case-insensitive filesystem, but Catalina may have other ideas…

The original post states the error as being the 'Install macOS Catalina.app does not appear to be a valid

OS installer application' nothing to do with the naming convention of the USB drive.

Reboot. Try again.

Safe mode reboot.

Reboot. Try again.

Good that you finally got this sorted. The zsh shell does not require escaping white-space as does the bash shell.