Install instruction:

1. Open XdeltaUI, and open the patch you want to apply (G Generation Overworld English Translation Patch [version].xdelta).
2. For source select you original Overworld iso
3. Set an outut file with a name of your preference, and press "Patch"

Extra HQ textures Installation (PPSSPP 1.3):

1. Unpack the contents of "NPJH50681.zip" into the "[PPSSPP dir]\memstick\PSP\Textures\" directory. Depending on your PPSSPP build, you might need to create the "Textures" folder before unpacking
2. Make sure texture replacing is enabled in PPSSPP (should be on by default). It is in Settings->Tools->Developer Tools->Replace Textures

If you have any issues or questions feel free to ask.