By default hqn_lsd will only serve licenses for one version of a product at a time. If hqn_lsd reads two permits for the same product, which differ in their version string, only the first permit read will be served. This is the default mechanism since it is generally required that new versions supersede old versions without increasing the total set of licenses for the product.
LispWorks Guide to the License Server - 16 Feb 2015