Welcome to the community.
Pro Tools Express would not have included a System ID.
Do you have an Activation/Redemption Code for Pro Tools 11? If not, and your Pro Tools Express is the Avid version (not Akai/InMusic) you can upgrade by purchasing the $199 Pro Tools Annual Upgrade and Support Plan from
http://shop.avid.com/ccrz__ProductDe...ku=DYNAPA20003