You can find it in his site (see his profile). But it is not free...
EDIT: By the way, I recommend you to wait because Blackwingcat always updates his kernelex.For example firefox 53+ doesn't work even with windows XP. If you want an up to date browser for windows 2000, you can use basilisk,k-meleon or palemoon. They work with Blackwingcat's kernelex. Roytam releases the binaries every week