I made them work on Win7 ultimate 64bit Italian. I think is a matter of language.
1. I renamed the .gadget file in .zip and unpacked in a folder called Clocktopia5.Gadget 2. Inside there were all the files but you have to put in the Clocktopia5.gadget folder all the files contained in css and js subfolder (copy and paste them, is better) not just leave them in the subfolders. Open the gadget panel and there they are.
Reviewed the gadget package, sometimes it has to do with your language settings. The gadget is optimized to work in english russian and spanish systems running at least vista sp1. If that is not your case, sorry, I'll try to update the gadget in the future, time permitting.
I think it has to do with something about the language settings for the widget. If you want, you can change the .gadget extension to .zip, extract and copy to a created folder by you named clocktopia 5 to your drive:/program files/windows sidebar/gadgets folder.