What did you try with pp_autolink? Installation is via the standard process using tools like cpan or cpanm. The pp_autolink script will be installed in one of the bin dirs on your path. For a strawberry perl installed under C:\Strawberry it will be under C:\Strawberry\perl\site\bin. It can also be found using where pp_autolink at the cmd prompt.
In regards to the file sizes, extrapolation from a single data point is prone to a high degree of uncertainty.
A better test would be to pack three or more executables, each with increasing complexity and dependencies. I suspect you will the difference is fixed at 4MB, as opposed to a three to one ratio.
There is also the -z flag with pp to increase the compression level. The default is 6, and setting it to 9 will maximise the compression level and produce smaller files (see https://metacpan.org/pod/pp#-z,-compress=NUMBER). It makes almost no difference with a simple print 'hello' script, but will help with more complex set ups.