For users of version 4.0, a free update to 4.1.1 is available, and strongly recommended, since there are many improvements and corrections.
The free update to Version 4.1.1 is available to currently licensed users of 4.0, on the Wenlin store, using your 4.0 serial number.
Users of versions prior to 4.0 can upgrade to 4.x for a fraction of the full price -- please see the upgrade page. (We make a distinction between free updates and inexpensive upgrades.)
Also, for users of version 3.0 or later, free updates are available to version 3.4.1 -- click here for version 3.x.
Also, for users of version 2.0 or later, free updates are available to version 2.7 for MS-Windows, or 2.6 for Macintosh -- click here for version 2.x.
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