If you are looking to download a 100% completion file (all weapons unlocked, Pro mode cleared) or a specific point in the game, you can find them on community sites.
Most "100% Complete" saves for Resident Evil 4 (PS2) include: Resident Evil 4 - -PCSX2 Memory Card Save File-
: Hosts collections of PCSX2-specific memory card files and cheat patches. How to Import the Save File If you are looking to download a 100%