Windows 7 and Windows 8 users known very well that installing third-party themes in Windows is not an easy task. When you download and install any theme from the web, it only changes Windows color and desktop background as well as many other visual styles without modificating any system files. For the security reasons Windows OS only supports officials themes pack that are downloaded from Microsoft websites. Directly, you can’t install any third-party themes in Windows 7 and 8 as well.
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Using some customization of system files we can disable this security features in Windows 7 and 8 but this is not a simple solution. Another best way is use any other third-party tool that will change Windows system files and enable third-party themes pack installation in Windows. There are lots of tools available on internet but the well known and most used tool is UXTheme Patcher. This customization tool is available from long time and now they have updated it with Windows 8.1 support. UXTheme Patcher is best and secure way to change system files to install third-party themes because it takes backup from the original system files to restore them later in case of any unexpected issue.
UXTheme Patcher supports both 32-bit and 64-bit Windows 8 version. It also check the files for compatibility during the installation to prevent any of support issue. But as we always suggest you to take system backup if you are going to apply any customization tool in Windows. For this you can use Image Backup software for Windows 8.
Download UXTheme Pathcer