How do I register my RepliStor software to obtain available updates?

Original purchase was Dec 2005. Original install was Feb 2006 using temporary licenses. Installing on three 4-processor machines and ten 2-processor machines. I don't think the original installation involved registering the permanent license key cards. Version installed was 5.3. Original purchase included a three-year maintenance agreement. That paper document cannot be found by the end user (not me). I'm hoping that I can register the "real" license key cards and obtain the upgrade to 6.3 under the maintenance agreement.

How can I register RepliStor?

Is the maintenance agreement tied to the permanent licenses?

If not, how do I obtain a copy of the maintenance agreement?