You only have a 5-count single license. You do not have 5 separate licenses. You will need to contact an Autodesk authorized reseller in your region to see what your options are for splitting the 5-count license and acquiring 5-separate licenses first (if that's even an option).
http://www.autodesk.com/resellers/overview to find a reseller.
Or you can just go buy a single (not upgrade) LT2015 license right now and not worry about it.