Trying to install 9.203003, but version 9.204019 is required for this up2date package.

seems like it was missing 2 other packages:

downloaded them to get the update process going.

Hallo Michael and welcome to the UTM Community!

Those version of 9.2 are over 6 years old.  I'm surprised that you didn't run out of enough space in the root partition to complete these Up2Dates.

Cheers - Bob

Every time I see those old versions, I ask myself why not make a fresh installation with an up to date ISO and restore a backup configuration?

BR

Because I did not receive this advise from sophos chat support.

So make a backup of config, make a new one then restore config is easier and works across this many version e.g. 9.2 all the way to 9.7?

Because I did not receive this advise from sophos chat support.

So make a backup of config, make a new one then restore config is easier and works across this many version e.g. 9.2 all the way to 9.7?

Correct, Michael.  If I remember correctly, V7.5 or newer can be restored to the current version.  Make sure you get several backups off the unit before installing a new version on it as the first thing that happens in the install process is the disk is reformatted.

Cheers - Bob
PS Kudos to Alex for thinking outside the box and coming up with the right answer to the underlying question.