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STS can be installed in two ways. First, SpringSource has prepared a bundled version with Eclipse and the required plug-ins. Second, if you already have an Eclipse development environment, you can simply extend it with the plug-ins provided by STS. Either way, make sure you already have a JDK (version 6 or newer) installed in your PC.
The simplest way to install STS is to download the bundle from the STS web site that has Eclipse bundled with it. So, you need to download the proper version for your development machine from the tools web site (www.springsource.org/downloads/sts). Figure A-1 shows the download site, with the versions available for the Windows platform (note that versions are also available for Mac OS X and Linux).