Did you buy Pro from www.limewire.com ?
Your payment of $18.88 covers you for 6 months of updates & email support. You only pay once for the Pro versions that you use during the 6 months but it's your responsibility to back up the installers so that you can keep on using those versions of Pro.
If you paid more than 6 months ago, your email address won't be in the database any more.
If you bought from another site, LW won't ever recognise your email address.