Starcraft 2 - Preparing Game Data Verified

We will proceed from simplest (least invasive) to most complex (last resort). Try these in order.

If your launcher is stuck at "Preparing game data verified 0%" or "Initializing," the Battle.net "Tools" folder might have been flagged as read-only. starcraft 2 preparing game data verified

Troubleshooting (step-by-step)