actually, win2k isnt listed there. Direct copy/paste:
The latest version of mIRC is mIRC v7.32 for Windows XP/Vista/7/8 and can be downloaded through this page.
If you are using Windows 95/98/ME/NT, you can download an older version of mIRC from here. Please note that this older version is no longer being updated.
So, what's the official answer?
