Upgrade from Trados Studio 2015 to 2017 on another computer

Hello team,

I actually work on my laptop with Trados Studio 2015 and have a free upgrade to Trados Studio 2017. I would like to install 2017 on another computer (it seems tome that this is possible) but definitely not know how to process. I mean... I have already installed it but I feel like all I can do is to get the license code for an upgrade on my old laptop. Could you help me with that?

It also seems to me that it is possible to keep Trados Studio 2015 on my old laptop if I do not migrate or desactivate it, is that true?

Thanks in advance!