Buy used UMDs on eBay, or download via PS3 → PSP transfer from the PS Store (still functional in 2025).
If you're not interested in buying a Nintendo Switch, there are other alternatives: mario kart 8 deluxe psp download best
In conclusion, it's not possible to download Mario Kart 8 Deluxe on PSP due to console exclusivity, system requirements, and licensing restrictions. However, you can play the game on Nintendo Switch or other Nintendo consoles. Buy used UMDs on eBay, or download via