The version numbers don't seem to actually mean a lot anymore.

The version numbers are based on the year and month of the release.

A number of different versions were published the next year.

The film has appeared in a number of different versions.

It has been released on the 17th of March 2013 with version number 5.3 after being in development since late 2008.

The first sitting is thought to have been in 1734 and a number of different versions were produced.

The film was released in a number of different versions.

Here's one reason to have a version number displayed in the about box.

A system has two numbers: a major and a minor version number.

As new specific features have been developed, they think that the major version number was necessary.