WWF No Mercy and WWF Wrestlemania 2000 not working

Hey, I just downloaded the current version of PRoject 64 and my ROMs that I've downloaded so far are fine except for WWF No Mercy, when I download it and I try to open it it will not work and say that it is not a valid Nintendo ROM, I thought that the file may have just been a bad copy so I downloaded it off a different site and I'm still having the same problems, so then I gave up on No Mercy and tried the next best thing: Wrestlemania and I had the same problems again, in both cases it tells me to verify these ROMs with Good64. I'm not good with PC's or this sorta stuff so apolagies if my problem is obvious etc. Please help with as much detail as possible, it will be much appreciated. Thanks in advance,

Chris.

I have tried unzipping it but it still doesn't work. And there is also a missing file I can't find any other site that lets me download it as everyone I go onto makes me vote etc. and then the site is "busy" or No Mercy isn't on it. Any help?