date_select error

Hi, when I try to use a date_select like this:

<%= date_select(:contact, :event, :discard_year => true) %>

I get the following error:

1 error(s) on assignment of multiparameter attributes

Ticket #3811
(http://dev.rubyonrails.org/attachment/ticket/3811/date_helper_megapatch_against_1.1.2.0)

Says it's already corrected but I'm using rails 1.1.6 an still get the
error.

How do I apply the patch manually on windows?

Thanks,

Gabriel.