It's not too hard to get a version of the Pro Game Maker v7:
        http://www.google.com/search?hl=en&q=site%3Agmc.yoyogames.com%20Drxj&btnG=Google+Search

After this, just load the .gmk, and modify oScreen:

    1. change the lines:
        screen_w = 672;     // was 320
        screen_h = 608;     // was 240

    2. change all follow-on references to "320" to use "screen_w" instead
    3. similarly for "240" to "screen_h"


You may also wish to run it in Debug mode, and set "global.drawHUD=0"