I need to install older version of mysql server on mac os, but I have a newer version.
I tried to remove this newer installation (5.1), but when start old version instal
Test finding all files and folders with "mysql" in their name, take a look at them and see if they must be deleted as well.
Use the following command to find all the files.
sudo find / | grep -i mysql
You can scroll through the output if you put | less at the end (it won't show anything up until it finds something, just so you wouldn't think the command failed.) :-) You can write it as follows.
sudo find / | grep -i mysql | less
To remove the files/folders, you will have to run the following command (-f means force so you won't be able to restore the files and you won't be asked for a confirmation before they are deleted):
sudo rm -rf /path/to/file/or/folder
Hope this will be of any help.