Now, if you have done your resurch, you would know that 7zip is a program whose curerent version (as of the fourth of May, 2019) supports windows 2000. While this means that you could just download it from the real website, programs are always updating and I don't knwo when they will drop support. Think of this as more of a mirror then the De Facto download spot.
for the proper website, please click here.
For the mirrored copy, Please click here.