From the publisher's website: Create and edit 4th Edition characters with ease, levels 1 to 30 Browser-based application, so it is Mac & PC compatible Save characters online to your subscriber account Import your characters from the previous D&D Character Builder version Note: This entry is for the newer (2010 and up) Online (Silverlight Enabled) Edition of the Character Builder. If you are looking for information on the older "Classic" edition (which was downloaded and run offline) you can find it at D&D Character Builder (Classic Edition).