GIMP Plugin Registry

I'm using a template for creating printed buttons that I downloaded off a website, only problem is it's a PSD image and Gimp isn't able to open it... because (according to the message prompt) that it can't open a CMYK and that the plug-in isn't able to.

Is there a plug-in that I can use so that I can upon the image in Gimp?

I should also mention that I am a very new user to Gimp... I've been using Photoshop for the past few years and according to my brother (The Computer Guy) I can't use it on our new processor.

Many thanks. :)