Here is Rivals of Aether II GameCube Controllers: A Setup Guide: How to install the Zadig drivers for native GCC adapter support with Rivals 2. Works with: Nintendo OEM, MayFlash, HandHeld Legend, Input Integrity, etc.
Rivals of Aether II GameCube Controllers: A Setup Guide
How to do the thing:
Link to the Zadig Driver installer: https://github.com/pbatard/libwdi/releases
Download and launch Zadig. If you’re using the a third party adapter, like the one from Mayflash, make sure you switch it to “Wii U” or “Switch” mode or Zadig won’t pick it up properly. If your adapter has a Slippi mode, use that.
From the “Options” menu in Zadig, select “List All Devices”
In the pull-down menu, select “WUP-028”. Ensure that its USB ID is “057E 0337”.
*If it does not appear in the list then try inserting the adapter (specifically its black USB cord) into another USB port and make sure it’s in Switch/Wii U mode.
On the right column, select “WinUSB” then click “Replace Driver”. Select “Yes” to modify the system driver.
When it says “the driver is installed successfully”, then close Zadig and go enjoy peak! You may (though probably not) need to restart your computer after installation.
Have fun!! Go to your local tournament!! ♥♥♥♥ Nintendo!!
If you need further assistance or if there’s something I should add to the guide, let me know 🙂