From Back Cover:
Guardians of Order charged for their fast play rules, though they also made them available for download from the Internet. However, the version they sold used glossy covers with illustrations pulled from the Silver Age Sentinels rule book. The Internet version was printer friendly, eliminating the full color covers. With Guardians of Order out of business, the only copies of the fast play rules booklet still available are used copies from Amazon and other outlets.
For Silver Age Sentinels, Guardians of Order created two fast play books. One for Tri-Stat, the other for d20.