A 'new version' will always have a new version number and in most cases will be a 'clean' number with NO patch numbers...(e.g., version 2.3.1 is newer than version 2.3.0 patch #4). A 'new version' typically has new features incorporated in addition to bug fixes.
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One of the most complicated questions is 'should you upgrade to the newer version?' In most instances, you should upgrade to the most recent 'patch' issued for your current version. Upgrading to a 'new version' (number) is more complicated: ...