Follow these steps to install WinMerge on Windows. If you are a Mac OS X user, skip ahead to the section on installing FileMerge on OS X.
Click the Download WinMerge-2.2.4-Setup.exe link to download the Windows Installer.
Figure 2. Click the Download WinMerge-2.2.4-Setup.exe link to download the Windows Installer
A list of download servers appears. Find a server located near you and click the download icon.
Figure 3. Click the download icon
In the next section, you configure Dreamweaver to recognize WinMerge as your diff/merge utility.