From the publisher's website:
Paul Lessack has kindly contributed a beautifully laid-out version of Microlite20. Weighing in at 17 pages, it's a 1.4Mb pdf that's as close to my vision of a complete professional Edition of Microlite20 as I've seen to date. It includes Character Generation, Combat, Advancement, Monsters, Equipment, Spells and the full Expert rules and GM Guide too!
This edition also contains the expert rules for Microlite20:
This rule-set allows for introducing a few more options to your Microlite20 game, without necessarily increasing its complexity. Included are: a new skill, new races, new classes, and some other (hopefully) good stuff. It is not necessary to use Microlite20 Expert Rules in its entirety; DMs are encouraged to "cherry pick" those specific items applicable to their own campaign.