In fact the entire fusiondrupalthemes.com website seems to be offline

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Poieo’s picture

Title: Unable to access handbook or subtheming handbook » Move Documentation to Drupal.org
Version: 7.x-2.0-beta2 » 7.x-2.x-dev
Assigned: » Unassigned
Issue summary: View changes

Fusion is no longer maintained by Top Notch Themes (fusiondrupalthemes.com). We'll work on getting documentation on Drupal.org.

Poieo’s picture

Status: Active » Closed (fixed)

Documentation is here: https://www.drupal.org/node/629408

It does need some updating.