Thanks for the heads-up.  It looks like catcoin.pw is down.

I've mirrored the Windows wallet here:
https://sourceforge.net/projects/catcoinwalletarchive/files/

Additionally, one can build a Windows wallet from source if they wish.  My 'alpha' instructions are here in MS Word DOC format:
catcoin_wallet_build_windows.doc

Source is here:
https://github.com/kR105/catcoin