Help.... I have downloaded Photofiltre and so far have thoroughly enjoyed using it, easy and user friendly.....UP TILL NOW!

Has anyone managed to download the plugins and got them to unzip.
I cannot for the life of me unzip the plugins I've downloaded.
I've saved the files in the plugin folder as directed, but everytime I go to unzip it goes into Adobethingy and that doesn't recognize them.
What do I do now? How on earth do I unzip the plugin files that I want?
Any help would be greatly appreciated
Jo