First make sure it\'s not on the DMG (as dfryer stated in the other thread...) i.e. drag the Planeshift 3D folder to your hard drive somewhere. If you can\'t delete it then, you can try selecting it, control-clicking and then \"Get Info.\" If you own the file and it is locked you can unlock it by unchecking \"Locked\". Otherwise you\'ll need the admin. But you need the admin for chmod anyway (I think), so I suggest you wait.
P.S. I believe that your problem is most likely the one dfryer mentioned. Simply drag the Planeshift 3D folder onto your hard drive or into your user folder somewhere and it should work.