Deactivate Premiere Elements 2018

I'm reinstalling Premier Elements 2018 to a new computer. I get the message that my activation code needs to be deactivated on another computer before it can be used again. There is no "deactivate" choice under the help menu on the other computer. I tried clicking on "Sign out..." (assuming that's the same as deactivate), and I get an error message that my copy of Premier Elements is corrupted and to reinstall. I can't reinstall because the other computer is running macOS Catalina and the installer for Premier Elements 2018 is 32-bit. How can I get it deactivated without reinstalling it?