pedrovalls's picture

Can I use the dictionary of version 5.5 in version 6?
Can I use the same serial?

No, the Version 5.x and

No, the Version 5.x and Version 6 dictionaries are completely different.

With Version 6, you already have eight different language dictionaries available.  Additional languages can be added.  In general, a dictionary that can be used with Firefox can be used with Version 6.  See the message thread at http://forum.mackichan.com/node/1411 for some discussion.