Bad CPU Type in Executable

OK - so I finally did figure it out. If I recall correctly, you will need to go to your library folder and actually completely delete the files for steam, even if you did not have it installed before. It makes no sense. There is a guide on steam's website as well, for folks who upgraded from 10.14 to 10.15 to follow - and even though this did not apply to me, the steps there actually solved the problem oddly enough.

My guess is Steam isn't 64bit only. Which Catalina is.

Just a guess on my part. I would ask Steam support.

https://help.steampowered.com/en/

having the same problem - did you ever find a fix?

I get the same message when trying to uninstall an older version of Postgres. I have a question into them too asking if the uninstall program is 32 bit.

I am having the same issue. Have uninstalled and reinstalled many times. Steam won't run - icon bounces in dock but doesn't open. Have searched for various "fixes" and nothing is doing it.