Upgrading your hard drive, motherboard, or even a major Windows update can break the license fingerprint. A license check will tell you if reactivation is needed.
| Issue | Likely Cause | Solution | |-------|--------------|----------| | “License key invalid” | Typo, or key for different version | Re‑enter carefully; check version compatibility | | “Activation limit reached” | Key used on too many PCs | Deactivate old installs via Nitro account | | “Offline activation required” | No internet or firewall block | Use manual activation file from Nitro support | | “License expired” | Subscription‑based license | Renew via Nitro’s website | | “Error 12007 / 12029” | Network/proxy issue | Temporarily disable VPN/firewall, or configure proxy in Nitro | Nitro Pro 13 License Check