If you have a legitimate purchase and need to activate your software, follow these official steps: Nitro Pro 10 Version Download - Activation/Installation
: Sites offering keygens or "extra quality" cracks are frequent hosts for trojans and spyware that can compromise your data.
activation is through official channels, especially since Nitro has retired the activation servers for version 10. The Reality of Nitro Pro 10 Activation Nitro Pro 10
: Nitro typically recommends that users of version 10 upgrade to the latest supported version (such as Nitro Pro 13 Go to product viewer dialog for this item. or 14) for better security and stability.
: Many generated keys will fail the validation process because activation requires checking against Nitro's database, which is no longer active for version 10. How to Properly Activate Nitro Software