Re: I had a free trial of Adobe CC on my mac at home and later purchased on a different computer PC at work. When trying to install at home I am prompted for the Adobe password with the pre-typed email address on my home computer, not the other email on m

If you are facing issue with changing the email address your Home mac computer, then you may try below steps once.

Click Gear icon on the top Right corner and Quit Creative Cloud App

Click on Finder and then hold Command + Shift + G keys on your keypad

It will open Go to folder window, type  exactly ~/Library and click on Go

Then open Application Support > Adobe > OOBE folders

Delete opm.db file.

Then relaunch Creative Cloud App and check if you are sign in page.