i see you are trying to get upgraded from v-5. wow that is a flashback. there are many many issues in trying to upgrade this, and you would need to analyze exactly what it is that you are wanting to retain from your current version to the most recent release.
what i understand about the dolphin license, but i really dont think it was applicable to v-5, is that you can run unlimited accounts on subdirectories, which is not the best method when trying to run a staging | qa | production suite.
outside of aesthetics, not why licenses are even a consideration. there are many components from v-5 that are not going to be compatible with v-7. even to get your user database upgraded could be a challenge. i am looking at sourceforge and do not even see the opportunity to upgrade from v-5 at all. I have upgraded from v-6.x.x, but not done v-5, since the age on that is non-supported, and as far as i know, without going directly to boonex, this could prove to be an overwhelming attempt.
if you have a programmer, then kudos to you, but they would need to have extensive knowledge of dolphin. There is one programmer that is non-boonex employeed, and that is James Tadeo. He has also been around since v-6, i honestly dont even know anybody including boonex employees other than andrew boone who have been around the dolphin scene pre-v6.
When a GIG is not enough --> Terabyte Dolphin Technical Support - Server Management and Support