Not sure how to install but this is how you change file paths in the USBLoaderGX channel:
Originally Posted by Bayonetwork3
-Remove all memory devices other than hard drive before starting the Wii.
-In the lower left corner of USBLoaderGX channel, click on the gears for the settings menu.
-Press + or click the arrow on the right side of the screen to get to page 2.
-The bottom option should be "Custom Paths", click that.
-D-pad down or drag the scroll bar to the bottom to find Gamecube Paths.
-Click on a line and it should default to your Hard Drive, if this app can use it.
Be afraid. Be very afraid.