This should work with 32-bit ActivePerl (and 32-bit Strawberry Perl):

ppm install http://www.bribes.org/perl/ppm/Win32-GuiTest.ppd
[download]

Seems there's no Win32::GuiTest package for 64-bit perls at bribes, however.

A full list of what's available from bribes, along with the commands that will install them, can be found here for 32-bit perls and here for 64-bit perls.

Cheers,
Rob