Hi Ian,
Thanks for using our plugins and I’m really sorry to hear about your troubles with the update.
I can get you started on this, but here on the pre-sales forum, I’m afraid we do not provide technical support. I would ask that you take any technical support questions across to our wordpress.org forum – our staff scan it periodically and other community members may also be able to help out.
If you have purchased a plugin from us, please login and post in the premium forums for that plugin and we can help you out there.
When updating our plugins the data that is already saved in the database is not touched at all. You should be able to access all the data you had before. The only exception could be if you are updating from a very old version.
If the data is missing from the database then the only way to get it back is if you have a backup; either a backup created with a plugin or manually, or the backup your hosting provider creates (if it is part of your package). If you yourself don’t have a backup, then get in touch with them, they might be able to restore your site to an earlier state, to get your data back.
I hope this helps!
Cheers,
Andras