Upgrade Procedure: Grab the link and unzip it. Delete all *.hle files(in SaveGames) as well as preferences.ini and rom.db from your memory stick. These files (*.hle, rom.db, and preferences.ini) are rebuilt when you use the software and are version specific. Then you can copy it to your current folder on your PSP and overwrite all the old files. Now you are guaranteed to be starting fresh.

Changelog:
Rev 427 [~] Forgot a couple of things.
Rev 426 [!] FlatShade and ViewPortHack should use flags to compare.
[+] Turok: The Dinosaur Hunter and Tigger's Honey Hunt will use DoubleDisplay.
Rev 425 [!]Reworked Double Display Lists, it is now enabled in roms.ini on a per rom basis as needed to prevent breaking roms