Sorry for assuming.
Here’s where you should find your AUs, if the directory was not manually changed by you.
First thing would be to check, if the the file is in there at all. I think during installation you can cross mark which types of audio containers you want to install. But since you re-installed already, you’ve certainly checked this.
What I did (and it somehow helped) is remove the file manually, logoff from MacOS, log-in again, open DAW to load plug-ins, close DAW, move file back into the folder, log-off from MacOS, log-in again, open DAW to load plug-ins and hopefully find it there. Maybe also rub the lamp and dance in a circle for 30s … ?