In between new versions of the framework, versions of the Software Development Kit that contain fixes for bugs may be released. These versions are called updates and are indicated by a change in the fourth component of the version number.
Updates are full packages of the Software Development Kit. They install as separate applications and appear so to the operating system. It does not update an existing earlier version to the new version. For example, versions 2.0.6.1, 2.0.6.2, 2.0.10.0, and 2.0.10.1 can all be installed at the same time. And different projects may be on different Software Development Kit versions.
Generally, it is best for projects to always be on the latest update. But the Software Development Kit allows different projects to be on different update version s for the following reasons:
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