Ruby/mysql not work on win32

i download the driver from http://rubysdl.s1.xrea.com/archive/mysql-winpkg/mysql-ruby-2.4.2-1-winpkg.zip
and simply use "ruby install.rb" to install it .
when i use it ,it shows error "mswin32-ruby16.dll not found "
how can i do now?
any other ruby/mysql modules?

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