The current version of the Character Builder is 4.0.7. You can find your precise version in the Character Builder's About dialog (Help > About). You can download the latest build from the download page, or use the Help > Check for Updates feature.

Here is a brief release history:

4.0.7 - posted 04/30/08
- Improved audio import now supports most audio formats including mp3
- New Loquendo menu for insertion of expressive cues and prosody tags
- Fixes a regression in 4.0.6 that could cause stutter and/or cacaphony in dialogs
- New Captivate project type sets the Straight Flash output type and 30fps frame rate
- Fixes problems with spurious shape placement on some character art when used
  with an external timeline controller, including Captivate
- New "Auto Action Level" character parameter controls the level of automatic
  animation that is generated, for use with future character updates
- New AIML rule panel in the CB and improved AIML engine stability in the CS
- Character Server now supports an external MySQL database for conversation management
- Character Server COM API adds support for compiling AIML files to binary MSF format
- New realistic and illustrated character products released on the Characters page
- Loquendo users - please note that we are now offering a Loquendo version 7 update, with
  new voice-changing capabilities (timbre and reverb). The update is required
  in order to add new voices to your installation. New voices introduced with
  v7 include Allison (USA English), Olivier & Charlotte (Canadian French), and
  Soledad (American Spanish).

4.0.6 - posted 03/12/08
- Realistic characters can now be resized
- Images can now be resized
- Entry panels can now be resized
- Fixes a bug that could cause loss-of-sync/stutter on Straight Flash output with long audio files
- Reduced pause between lines in a dialog improves the flow of multi-character projects
- New Character Server Decode API enables the built-in Flash microphone support
- Character Server package now includes a load simulation tool and a monitor component
- Fixes a Character Server bug that could cause seemingly random syntax errors at high volumes
- Fixes a Character Server bug that could cause false hits in the cache - please delete the contents
  of your Flash and Wave directories after installing this important update
- Removes a Character Server limit on the length of a single say action - the limit would cause
  the mouth to stop moving after about a minute of audio - there is now no limit
- Windows 2000 has not been supported for some time, however up until this release the Builder
  would still run under Windows 2000. With this build you will need to add a compatibility dll to the
  program directory in order to continue to use Windows 2000.

4.0.5 - posted 01/25/08
- Updated John and Jane (full-body realistic characters) featuring improved animation, new emotive
  actions, udpated idles, and a slightly larger size - see John and Jane testers
- Updated bust versions of John and Jane use a taller format that shows more of the body, and
  have a full set of hand actions, emotive actions, and new idles - see John and Jane testers
- The head and bust versions of John and Jane, as well as new versions of several other stock
  characters, are available for download from the characters page
- New Crop feature (Character object, Advanced tab) allows you to crop a full-body or bust character
  down to a smaller size, without needing to hide a portion of the character using another shape
- Fixes a bug affecting realistic character addons, such as Mia CSR Mic, when use with the new idles

4.0.4 - posted 12/26/07
- Server release only - fixes a 4.0.1 regression that can cause a fault to occur sporadically, while
  processing requests using templates and '$' variable expansion.

4.0.3 - posted 12/17/07
- Adds new Render to Video FLV and MOV options, ideal for use with YouTube and other video apps
- Adds a new Screen Capture option to the New Project wizard and introduces a simplified technique
  for creating compelling tutorials using compatible screen-capture tools
- Fixes a 4.x regression that can cause text created in Design View to revert to Arial

4.0.2 - posted 12/03/07
- Minor update fixes a problem that can affect how certain fonts appear in
  imported Powerpoint files

4.0.1 - posted 11/25/07
- Significant update introduces new Powerpoint Import feature
- Registered users can update at no charge, trial users obtain a new trial period
- Powerpoint Import requires the .NET 2.0 runtime - the runtime will be installed
  automatically if needed, and is also available here
- New library pane for drag-and-drop insertion of Library objects
- Improved integration with Character Server with updated Presentation panel
- Character Add-ons and options are now managed in a uniform manner in the
  Character's Advanced panel. However you will need to update any installed
  character add-on packages from the characters page.
- New AIML <system> and <condition> tags
- Updated Bubble object pages through text that is too long for the bubble

3.0.158 - posted 10/03/07
- Adds support for new Emotive actions (e.g. Angry, Sad, etc.) for James, Jessi
- Adds new 'Eye Tracker' idle and improves 'Simple' idle on James, Jessi
- Adds Disable for Render feature - lets you selectively focus on certain scenes or slides
  during development of a large project (see the right-click menu on slides, scenes)
- Improves handling of error and warning messages in Character Builder by bringing you directly
  to the source of the error where possible
- Updated Character Builder Extensibility Kit package now includes Custom Character wizard to
  make it easier to get started with a custom character
- Fixes a bug affecting pause/resume in Dialog objects
- Fixes a bug leading to loss-of-sync in Straight Flash output on certain renders
- Updated Character Server fixes a bug that could cause periodic failures in Speech Server

3.0.157 - posted 8/22/07
- Improves Render to Video performance
- Fixes blanking-out problem on Render to Video with some updated cartoon character animations
- Lifts an earlier limitation on moving the focus to a dialog
- Updated server includes video improvements and fixes a bug that can affect cache operation

3.0.156 - posted 7/09/07
- You should notice a significant speedup of the Render-to-Flash function over prior builds
- The Audio Quality option (Outline View, select Project icon, Advanced tab) now includes
  a range of quality settings, instead of just 'normal' and 'high'
- New 'trace' option in Query View, and some minor AIML bug fixes
- Fixes Dave and Dianne visual bug affecting talk during a head nod or head shake
- Improves Server performance and fixes a cascading error that can occur with locked cache files

3.0.155 - posted 6/30/07
- The Character Builder includes changes to the New Project wizard and reference documentation,
  and is designed to match build 155 of the optional Character Server
- The Character Server includes significant architectural changes, performance improvements,
  and a new CGI API - please see KB109 for details.

3.0.154 - posted 5/29/07
- Fixes the Goto and Start action target selector in the Button panel, and the
  Initial Focus selector on the Project panel
- Fixes a regression in the SCORM template
- Adds Finger Wag action and fixes Look At actions for Dave and Dianne

3.0.153 - posted 5/22/07
- The base package now includes Dianne, Mike, and Jane - these characters were
  available as separate downloads in build 152. To minimize the download
  size, characters with multiple formats (e.g. head, bust, and full-body) will continue to
  be available as seperate downloads in their alternate formats.
- Updated Dave character - changes are largely structural, but improved head actions,
  including new nod and shake actions and smoother motion, may be noted
- Updated Dianne character - in addition to structural changes, this character is now
  slightly more conservative in appearance
- New Import Text wizard in Script View is handy for importing entire paragraphs of text
- Script View's Import Audio is now presented as a wizard
- The Builder now automatically checks for updates
- Miscellaneous improvements to Setup and documentation

3.0.152 - posted 2/7/07
- Updated versions of illustrated-head characters - improvements are largely structural,
  but more pronounced head turn and smoothness may be noticed
- You will need build 152 or later of the Builder/Server to take advantage of the updated
  illustrated head characters
- New Import Audio button in Script View will create a script from an external audio file -
  the feature works by breaking the original audio file into sentence-sized audio files
  with matching placeholder transcript text
- Simplifications to the New Project templates and improvements to the first-run experience

3.0.151 - posted 12/30/06
- You will need build 151 or later of the Builder/Server to take advantage of updated characters
- A redesigned James and Jessi now feature increased realism - please see the characters page
  to see the new versions, as well as download older versions for compatibility
- James and Jessi are now also available in a new Bust style - this style shows more of the body
  and includes hand gestures
- Jane's skirt has been lengthened, and bust and head versions are now available for download
- John and Jane now support Shared Libraries for improved operation under the "Multiple File"
  mode, which is recommended for larger projects
- A new "Progressive Idle" character idle behavior setting can be used to load more detailed idle
  behavior over time - use with Multiple File output and Shared Libraries settings
- Render engine improvements address several issues with realistic character construction,
  including "alpha-jitter" and "black frame" problems
- A new "Back" navigation action helps with projects involving branching