It is possible to install the patch without having your Wii connected to the internet.
Step 1 – Run the Downloader
Within the patch method, there will be a folder called “Downloader” for either Windows, or Mac and Linux systems. Plug your SD card into the computer, then open this folder.
If you are on Windows, run Downloader.exe and select your SD card.
If you are on Mac, run Downloader and select your SD card.
If you are on Mac or Linux, run Downloader.py through the terminal. Requires python 2.6 and tk/tcl, which come with most distros.
Step 2 – Run the Patch Installer as normal
All the files necessary will now be on your SD card in a folder called “patch”. Run the patch program and it will automatically detect and use those files instead of an online connection.