Can CC 2023 run on an IMac 2012 OS Catalina?

yes, but you won't be able to use the latest cc app versions.

for the latest versions you can use, check here: https://helpx.adobe.com/creative-cloud/system-requirements.html

and for those older versions, most adobe download links are available from prodesigntools.com. https://prodesigntools.com/adobe-direct-download-links.html

follow the directions (esp, step 1)

save the install file. it may not remain online.

thank jim @ prodesigntools.com

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in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post if it helps you get responses.