Rails - Aug 2006 - Rails security update

I see there is a mandatory security update out for rails today
(http://tinyurl.com/lvqjs), but I cannot get it to install on XP.
Anyone having a similar experience?

C:\ruby\bin>gem install rubyzip
Attempting local installation of ''rubyzip''
Local gem file not found: rubyzip*.gem
Attempting remote installation of ''rubyzip''
Successfully installed rubyzip-0.9.1

C:\ruby\bin>gem install rails --include-dependencies
Attempting local installation of ''rails''
ERROR:  Error installing gem rails[.gem]: No metadata found!

Actually, I was getting: (Zlib::BufError) buffer error, so maybe it''s
enroute to being fixed?

Regards,
Rich