Looks like what you need is VMware Converter 4.0.1 which is the last version that supported Windows 2000 SP4.
Search engine results will show some site(s) for download. I guess it is a matter of trust whether you want to download them.
Search engine results will also yield the supposed original SHA1 and MD5 checksums of the original downloads; again it would be a matter of trust.
EDIT: MD5 of the 4.0.1 download is found in an image in this communities link
vCenter Converter and v4.0.1 download?