Portable Unity not working

Hello world.

Alright so currently I only have unity on my litterally falling apart laptop and wanted to be able to use my houses main computer to program to. So instead of downloading it again on every computer I want to use it on. I downloaded all the files onto a flash drive to make a portable Unity so to speak. However when i go to use it, it tells me that i need to register. So i guess my overall question is,Why?

Unity needs to be activated on each machine. Just go ahead with the activation. If you need help migrating from your old laptop to your new machine just drop support@ an email.