Cubase 10 Pro - Interface Needed for Playback

I went out and bought a laptop because I would like to be able to record, then take the laptop with me and edit the recordings at the beach or something. I cannot find out on Google if I need my interface or not for playback. If it matters, the interface is Scarlett 18.

Second Question: I actually haven’t installed it yet, but the box, I just noticed it…it says Software Installer Not Included and that the box contains the download activation code. I am new to this. Does that mean I download the access code, and that enables me to get the software installer?