Logic Pro 13 not working on Intel iMac

Haven't you created a backup before updating? If not...

1. Create a backup.
2. trash Logic 13
3. Sign into the AppStore and look for purchased apps. Sometimes you have to manually trigger the download by going into the store as if you were going to buy Logic. You don't need to buy it again.

I see. Logic 9 was available on CD. It seems you've never purchased Logic 10, 11 or 12 from the AppStore, right? You can not update from Logic 9 to 10 and higher. You need to purchase a Logic version from the AppStore for about 200 bucks as a One-Time Purchase. You could also subscribe to the Creator Suite but before doing that, do your own research. I personally don't like subscription models. Until now every update of Logic was free (since around 15 years), but we don't know what apple is planning in the future.

Compatibility is a question of MacOS and processor-type. You may have to buy Logic 13 but a compatible version will or should be (hopefully) installed on your computer.

To be honest, I'm a little bit confused... However, it's a good idea to talk to Apple Support.

Hi - Thanks for your reply. I've tried the above. I can download my first purchase Version 9.1.8 but I need V.12.4. If I download 9.1.8 and try and update it takes me back to Logic Pro 13 - which won't work on an Intel Mac. Do you have 12.4 ?

I bought Logic Pro on 17th September 2012 - see the image attached showing the icon. I have been updating when updates were available ever since - right up to 12.4. - Thanks for your help. I will continue to get Apple to make previous downloads available.