It looks like you installed the mutators correctly but I'm not sure how you're trying to load them into your game.  The mutator=XXX commandline section is if you want to run a server.  Since you want to use these mutators locally you don't need a server.  You can use UT3's &quot;Instant Action&quot; and just add the mutator to the game.

1. Go to &quot;Instant Action&quot; on UT3's main menu.

2. Select the game type you want, click &quot;Next&quot; at the bottom right.

3. Select the map you want, click &quot;Next&quot;

4. At the bottom there should be a &quot;Mutators&quot; button.  Click on that.

5.  There should be a list of available mutators on the left.  Select the available mutators you want to add and click the &quot;Add&quot; button at the bottom.  The mutators should appear on the right list labled &quot;Enabled Mutators&quot;

6. Click the accept button.

7. Click &quot;Start Game&quot;.

If you're using nohomedir when you start UT3 then you need to install the mutators differently.  I'm going to assume if you know about nohomedir you should also know where your config and mutaros need to go- nohomedir is something you need to manually add.