The software will display a unique "PC ID" or "Computer ID."
: Enter your unique code into the box and press "Authorize" . How to Get Your Authorization Code mitcalc authorization code link
For versions prior to 2019, some licenses required you to log into the MITCALC user portal. Your link would be found under . Newer versions (v3.0 and above) rely almost exclusively on email links. The software will display a unique "PC ID" or "Computer ID