Ruby on Rails

I am evaluating RubyMine but am getting the following rake issue...

C:/Ruby192/lib/ruby/1.9.1/rubygems.rb:340:in `bin_path': can't find
executable
rake for rake-0.8.7 (Gem::Exception)

There are many web pages (through Google) that discuss this, and several
recommend applying a patch and link to a .patch file
(0001-version-bundled-gems-during-installation.patch). This file opens
in TortoiseUDiff but the problem is...

How to apply the patch?

Everyone seems to assume that the world and his dog actually know how to
apply the patch and yet I guess there must be many Newbies like me that
have no idea.

I am an experienced and seasoned developer but totally new to Ruby.

Any help gratefully accepted.

Kind Regards
Steve
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