Microsoft Dynamics GP requires a Site Name in conjunction with its registration. The Site Name is entered in the Registration window.

NOTE: Spelling, punctuation, capitalization, and even extra spaces can cause DynamicZip's keys to fail. By doing a File » Print from the DZ Registration window you can generate a file containing the exact Site Name. Sometimes examining a text file will make it easier to detect an extra space.

Why won't my DynamicZip registration keys work? FAQ
Glossary