I bought, downloaded, installed and played Twilight Of the Arnor and Dark Avatar expansions.  It all worked fine.

Today I changed my email address.

When I started Stardock Central today, it came up with the error "Failed to validate your Dark Avatar (expansion pack) registration information.  Please verify that you have entered your email address and serial number correctly."

I got the same error for Twilight of the Arnor.

The expansion does play however.

Is the error the result of changing my email address after buying the game on my old address?  Is there a fix?  What are the consequences of this error message please?

Thanks