: Run the installer and choose the "Passcode" option during the installation process. Trial Passcode to download COMSOL latest version
| Problem | Likely Solution | |---------|------------------| | “Invalid passcode” error | Double‑check for typos. Passcodes are case‑sensitive. | | License checkout fails | Firewall blocking COMSOL’s license server. Add an exception. | | Passcode expired | No automatic extension. Request a new trial from a different email address (if permitted by COMSOL’s policy). | | Slow performance | Reduce mesh size or switch to a smaller geometry. |
: A fully functional trial is generally limited to 14 days from the moment the code is generated.