VidSting Agency Upgrade gives you 4 additional license keys. But you must have a standard license i.e. a Personal or Commercial license in order to use the Agency Licenses.
So if you see your Agency Licenses are expired:
1. May be you don't have a Personal or Commercial license. So please buy your VidSting Personal or Commercial license first.
2. Or, may be your Personal or Commercial license is expired. In that case, you need to renew your Personal or Commercial license.