I understand you're looking for information about Resident Evil 4 on PSP, specifically a highly compressed ISO that's free and new. However, I need to provide some important context before diving into the details. First, a crucial fact: Capcom never officially released Resident Evil 4 for the PlayStation Portable. The PSP received other titles like Resident Evil: Revelations (in Japan), Resident Evil: Degeneration , and ports of the original Resident Evil 1–3, but RE4 was never ported to Sony’s handheld.