feat: add note about using both plugins

static/md/install-wiiu.md

@@ -34,6 +34,8 @@ Make a copy of your `aroma` environment folder and rename it to `SPFN` - this wi
 
 For users who previously used Pretendo's Inkay plugin, delete the files `plugins/Inkay-pretendo.wps` and `modules/Inkay-pretendo.wms` from the SPFN environment.
 
+### Note: using both Pretendo and Splatfestival Network plugins on the same environment will cause issues! Please do not do this.
+
 Download the plugins and modules found on the [Downloads page](/downloads/) - make sure you enable file name extensions in your file browser and take note of the extension.
 
 - `Inkay-spfn.wps` goes into the `plugins` folder