Project Plus only works with the NTSC-U (US) disk, PAL (EU) & NTSC-J (JP) will not work.
This method ONLY works with SD cards that are 2GB, anything higher and this WON'T work.
Section I - Installing
If you have any custom stages, you need to delete them. Don't assume you don't need to this because you never made any, Brawl makes 3 custom stages upon the creation of a save file.
Extract Project Plus to the root of your SD Card
The root of your SD Card should now look like this
(root)
apps
private
Project+
boot.elf
Turn on your Wii and boot the Smash Bros. Brawl disk without the SD card inserted
Go to the vault in the game menu make sure to delete all the custom stage even the ones that are included with the game, then close out of stage builder
Then once you're done, insert your SD card and go into stage builder, the exploit should run
Now every time you want to boot into Project Plus just navigate to the stage builder
Homebrew requirements
A hacked Wii with the homebrew channel installed
An SD Card that is in the range of 2GB to 32GB that is formatted to fat32 anything above will not work
Launch the load Priiloader app from the Homebrew Channel
Navigate to load/install file, then now install Project Plus
Navigate to settings in Priiloader then set autoboot to installed file then save the settings and now every time you turn on your Wii you will boot into Project Plus