iMac 14,1 with OS Sierra 10.12.6 upgrade to Catalina

With the Catalina installer.app in my application folder I'm trying to create a bootable usb disk using this command in the terminal:

sudo /Applications/Install\ macOS\ Install macOS Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/SanDisk1

the terminal's response: /Applications/Install macOS Catalina.app does not appear to be a valid OS installer application.

After looking around on the web I noticed I'm not the only one with this problem. I've tried another suggested approach by

using a to the desktop copied Catalina.app instead with this command:

sudo /Users/MYNAME/Desktop/Install\ macOS\Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/SanDisk1

terminal's response: sudo: /Users/MYNAME/Desktop/Install macOSCatalina.app/Contents/Resources/createinstallmedia: command not found

yes, i used my real name instead of MYNAME .

I do need to make a clean install since i've been accumulating junk for years and it has to go.

Please help.

Thanks

> sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/SanDisk1

terminals reply: /Applications/Install macOS Catalina.app does not appear to be a valid OS installer application.

please note: i just started a new thread: Creating a Bootable Catalina installer

thanks

Thanks!

because the topic is flagged with solved