The Visual Novel GO! Magical Boy (release 006, updated 28 Oct 2008) can be downloaded from:
http://www.download.com/3000-20-10536283.html (Windows non-Vista, note: older release 5)
http://www.renai.us/game/gomagicalboy.shtml (Windows non-Vista, note: older release 4)
Czech version by denzil (big thanks, based on release 5):
Title: Go! Magical Boy
Maker: Alessio Sapora
Website: Visual Novels: Finished and Upcoming
Release Date: 2006-03-29
Playtime: approx. 70 minutes
Categories: BxG (bishoujo), VN (Visual Novel)
Rating: all ages
Platforms: Windows, Mac, Linux/Unix (cross-platform ZIP file)
License: Creative Commons Attribution-NoDerivs 2.5
Life would be pretty nice if it wasn't for the fact that you seem to be the wrong person in the wrong place at the wrong time. You just moved, have made no friends yet, are late for dinner, and about to bump into the scariest situation you could have imagined. On top of that, a strange woman picks you up and burdens you with an impossible task. And man, now you're REALLY late for dinner. Did I mention the girls? No? Well, there's even more trouble ahead.
Release 006, uploaded 28 Oct 2008, includes sources (images, script) and upgraded the Ren'Py engine from 5.4.4. to 6.8.0. Part of Lara's phone dialogue was rewritten.
Release 005, uploaded 25 Oct 2006, corrects spelling mistakes, cleans up some code, displays the player name, and shows dialogue with quotation marks. Also, a new Ren'Py splashscreen was added. :)
Release 004, uploaded 02 April 2006, corrects the bug Kikered found (see his post of Sun Apr 02, 2006). Also one minor spelling correction.
Release 003 was uploaded on 31 March 2006. If you have already played GMB before and are not sure if it's worth downloading the new version, read the section below.