I should structure the response with sections: introduction, game overview, gameplay features, downloadable content, legal download information, and frequently asked questions. Make sure to address the confusion between the international version and a potential sequel, clarify legal issues, and provide accurate information based on known facts.

Also, technical requirements for the PSP, such as firmware version for the PlayStation Store download. Some users might be on older firmware and need to know that. However, since the PSP is obsolete, this information might be helpful but not necessary unless someone is nostalgic playing it on an emulator.

Finally, wrap up by recommending legal avenues and discouraging piracy while providing the necessary details the user requested. Make sure the language is clear and the information is accurate based on my knowledge up to 2023.

The user might be conflating the international version with a sequel. So, I should clarify that there isn't a specific "Impact 2" as a sequel but that there are enhanced international editions. It's important to note that the user is asking about a download, so I should address the legal aspects of downloading games. Emulating the game is legal if you own a copy, but downloading the ROM without owning the game is illegal. I should make that point clear.

Need to check if the Japanese version had "Impact 2" separately. From what I remember, the main title was "Naruto Shippuden: Ultimate Ninja Impact," and the international version released by Konami in 2011 added extra content but wasn't a separate part. So, the user might be referring to the international version as "Impact 2." I should mention both versions and their differences.