Hey there, Everton!
I’m glad I stumbled upon your post. I’m having problems, too, and I used your Chris Pirillo script — and it worked beautifully.
Here’s where the .php file goes:
wordpress\wp-admin\import
It showed up as the last entry on the page after hitting the “Import” tab.
In Firefox, I found that I receive “script timeout” errors that offer “Stop” and “Continue” — if you’re using this browser or MSFT’s IE gives you a similar error, keep hitting continue.
hope that helps,
Michael Hainsworth
https://www.hainsworth.com (currently https://files.hainsworth.com during the conversion)