Apple Intelligence download stuck on macOS 15.2

I thought I would update to report that the problem is still not resolved with the update to macOS 15.3. Whilst it seemed promising to begin with, the problem has shifted but is still essentially the same. Now when I selected System Settings > Apple Intelligence & Siri, in the second pane of the dialogue it has the message "Downloading support for Apple Intelligence. Connect Mac to Wi-Fi and power while models are downloading". There is an animated moving circle and every time I reopen the window it starts at 0% complete... - then quickly updates to 100% complete... - but it remains there and never progresses. I have restarted and reopened the window many times and it seems stuck yet again. Has anyone else found a fix for this?

I've been unable to research fixes beyond command line stuff where I have to turn SIP off and on and I feel that if Apple rolls out an official update that's broken, it should be fixed by Apple rather than users who don't feel confident to do so. An iOS 18.2.1 bug fix update came out today but it doesn't seem that a macOS 15.2.1 update exists - I was hoping this might be out to fix this problem given the 60 odd "me too" votes for this post alone. Does anyone know if the fix for this bug is included in the upcoming macOS 15.3 update?

I've managed to fix this but not sure if it will work for others. I toggled Apple Intelligence off and on again. This didn't fix things but then I noticed that the Language setting in the Siri Requests section had no selection (previously this had been set to English (United Kingdom). I got an error message whenever I tried to select English (United Kingdom) again. I then selected Arabic (top of the list) which I was able to select. After successfully selecting Arabic I selected English (United Kingdom) and this was now selectable. I then turned off Apple Intelligence, rebooted, and turned on Apple Intelligence again. This time the components downloaded quickly and the feature became available. It felt like I got it working by lots of clicking rather than anything clearly repeatable.

Thank you for the suggestion - I did this in response to your recommendation - and read that this deletes caches etc so was hoping to see a result. Unfortunately after several hours there doesn't seem to be any noticeable change at all. In the "Storage" tab of System Settings under MacOS, Apple Intelligence is listed as taking up 5.5GB and this has been the case for several days.