Copy the entire link. Paste it into Notepad first to check for hidden characters. Then copy from Notepad into the activation window. Error 3: "Connection to activation server failed" Cause: Your firewall, proxy, or antivirus is blocking MITCALC.
Temporarily disable any VPN or proxy. Add mitcalc.com and license.mitcalc.com to your antivirus/firewall whitelist. Use port 443 (HTTPS) – MITCALC does not use custom ports. Error 4: Link expires immediately (time-limited demo licenses) Cause: Some evaluation licenses are valid for only 7 or 30 days, and the link auto-expires after the first use. mitcalc authorization code link
You need to deactivate the license on the old machine first. Go to C:\Program Files\MITCALC\ and look for a tool called DeactivateLicense.exe . Run it, then use the same link again on the new machine. If that fails, contact MITCALC support with your order number. Error 2: "Invalid link format" Cause: You may have copied only part of the URL, or extra spaces/line breaks were included. Copy the entire link