Download A license key for Windows Style Builder can be purchased for €25,00 (ex per-country specific VAT). Problems or 'How do I do'-questions regarding Visual Styles are not answered. Of course, bug-reports are always tried to be solved.
If you plan to upgrade Windows 10 RTM build to later Insider builds, it is better don't use any third-party theme. The theme is claimed to be compatible with Windows 10 x86 and Windows 10 圆4 however with Windows 10 following the new continuous updating model, this theme can break on future Windows 10 builds. After that, you can get something like this: To get transparency and rounded borders, you will have to follow this guide.
The author of this theme recommends using the AeroGlass mod for Windows 10 to have a more genuine look. The Taskbar is not skinned to become glassy like Windows 7 because Microsoft disabled that ability in the RTM build of Windows 10.