Assuming as Zargg wrote, you purchased a retail copy of a Cakewalk DAW one time then purchased upgrades through Platinum, you only have one license. If you were to transfer any version, whether registered or not, you would have to transfer your license as well. IOW, after the transfer you would no longer have a license for any of the products from the original purchase through Platinum.
If all the purchases were full retail purchases and not upgrades and never registered, you may dispose of them as you wish.