I don’t think so. The update code (when entered in the Steinberg Download Assistant) will look for the license from which to update in the eLCC. If your Absolute 4 was on the USB-eLicenser, it needs to be plugged in and registered in order for the update to take place.
While there is still time and if you can source a new empty USB-eLicenser, I think your only option is to request Zero Downtime to recover your lost license and proceed from there …