If not present, create the memcards folder or check emulator settings → Memory Cards.
To download and install Resident Evil 4 save data on AetherSX2, you typically need a or .max save file and the BIOS memory card manager within the emulator. Why Download Save Data for RE4 on AetherSX2? download save data resident evil 4 aether sx2 2021
Verify the save: