Drummer is not working in Logic Pro

I am trying to use the Session Drummer in Logic Pro 11. I have downloaded all available sounds I believe.

When I select a drummer I get the message This Session Player uses an instrument that is not installed on your device. It suggests downloading something. I do. It then says need to download more sounds. I do.

No matter what I do what then happens all I get is weird low register electronic pulse sounds. This applies to whichever drummer I select. I have rebooted the Mac a couple of times and gone in and out of Logic and nothing works.

It's the final Intel iMac and drummer has always worked perfectly.

[Re-Titled by Moderator]