The email says:
After you install ZCS, please install the attached license file to activate your 60 day trial. You can do this by accessing the ZCS Admin Console and running the license wizard. Select "Global Settings"
choose the "License" tab.
Admin console URL (replace "yourservername" and "yourdomain"
with your actual server name and domain):
but it is asking me during install to do this as #20 under store configuration. up until this point i was doing ok.