For the emulator on PS Vita, you must place your save data folder in the following directory using VitaShell : ux0:pspemu/PSP/SAVEDATA/

: If the file you downloaded is a .mcr or .gme (original PS1 formats), you may need to use a tool like MemcardRex on your PC to convert it to a .VMP file compatible with the Vita.

Via VitaShell:

The PS Vita stores PS1 saves in a virtual memory card format. To use a 100% save file from sites like (which are usually in formats), you must convert them: PS3 Method (Easiest) : Download a virtual memory card save for PS3 ( format). Transfer it from your PC to a via USB, then use the PS Vita Content Manager to copy that save from the PS3 to the Vita. Homebrew Method