What version of Cubase did you buy? And what is/are the licenses now on your eLicenser? Any license can only be activated once, and point updates like 7.5.40 never have a separate license.
You have to understand that the eLicenser is something like a wallet containing your licenses - you don’t activate the dongle itself and don’t need to buy a new one unless it physically doesn’t work anymore. DO update the eLicenser software though, which is a go-between between the ‘wallet’ and the installed software (Cubase). BTW, the 25 hours I think you mean is a time limited license for the Fraunhofer MP3 codec only.