My Gamecube adapter doesn't work

If you have issues with your official Wii U GC adapter, try:
-Plugging in your adapter by only the black cable
-Closing all other programs such as Dolphin that take control of your adapter
-If you use Massive's GC adapter program, have the driver program open and click 'start' before launching Slap City
-Reloading all controllers/Reseting Direct Input in the Slap City Controllers Menu
-Enabling/Allowing all DInput controllers in Slap City from the Controllers Menu
-Simply restarting Slap City

If you're still having issues, try:
-Updating Windows
-Running Zadig again to replace your WUP-028's driver
-Connecting your adapter via a different USB port
-Disconnecting other USB devices

Resources:
Massive's GC Adapter Dev Blog/Download site
Zadig Download (Also included in Massive's Adapter DL)

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How do I get my DirectInput controller working?