The good folks at GameFront have picked up on The Witcher 2 being updated again. This v2.1 patch will correct and amend the following:
Version 2.1 Corrections/Amendments
1. A new system has been implemented improving communications between game installations and both the registration server and ‘Arena’ mode leaderboards.
2. A number of corrections have been introduced to the Witcher 2 Configuration Tool.
You can download the patch from here.
