In reply to Neo.

Ah...ok. Thanks Neo. I think I may need to contact the theme developers directly and see what their position is (if they have one). Not able to go back to my clients and ask them to drop more $$$ into a support package that was initially offered as 'lifetime support'.

As an aside - I'm a business person too, and I don't begrudge a company trying to earn a profit, but I do ask that a company honors the initial agreement.