How do I upgrade my Mac Pro late 2013 from High Sierra to Catalina?

Back up your data, check your applications for compatibility, click here, and then on the download link for Catalina.

Catalina and newer won't run 32-bit software; download and use Go64 as well as using the first link above.

(220612)

Hi,

You can upgrade your Mac Pro to Catalina by opening the link down below and downloading Catalina from the App Store.

Download link: https://apps.apple.com/us/app/macos-catalina/id1466841314?mt=12

Hope this helps.

sorry, disregard, I mis-read your question.