If anyone has any suggestions, please let me know. I understand the need to update, but considering an update might render my macBook obsolete I am desperately looking for a way to get the updates to work on Catalina, especially Lightroom as it is my main tool. the latest updates of Photoshop and Lightroom won't install on Catalina. So I have fended off all requests to update the MacOS. Due to the 'trick' I use I really do not want to update to Big Sur or Monterey, afraid this trick won't work anymore. When I got the Macbook, it ran MacOS Catalina. Are there issues using current Adobe apps in Catalina See the following documents for known issues with Adobe apps and macOS Catalina: Acrobat compatibility with macOS 10. See how to update your apps to the latest versions. I have been using it for some years now and although it only runs with the charger connected, I got it for free and have been happily using Lightroom and Photoshop on it. How to update Creative Cloud apps You can update your apps using the Creative Cloud desktop app. The 'dead' battery causes CPU throttling which would render the MacBook unusable, but I can disable the throttling by a neat trick: boot the Macbook, wait for it to show the desktop, close the lid, count to 25 and open the lid again.
He dropped a cup of thee on it and that probably damaged the charging circuit as the battery was no longer charged and is 'dead' now. Long introduction to prevent wrong answers: I have been using my son's old MacBook Pro 13 inch retina from early 2015 for some years now.