On September 10th, 2012 Caphyon Ltd. announced the release of Advanced Installer 9.5 in Freeware, Professional, For Java, Enterprise and Architect editions. The 9.5 release includes many enhancements (see the release notes), but what really caught my eye is a new group of dialog themes that use the "Windows Store App" style:
The theme is also available in red and white/green. By the way: these screenshots were taken on Windows 7, so Windows 8 is not a requirement for this dialog style.
These themes also reduce the number of dialogs a user has to click through, by omitting the Welcome dialog and combining the destination folder selection and the checkbox to agree to the license agreement on the same dialog with a big "Install" button. However, if you actually want to read the license agreement before you agree (but no-one does that, right?), you have to click a link. -You may want to check with your legal department if that's sufficient.- The link will open an additional dialog with the license agreement and an "Accept & Install" button, so you don't have to return to the previous dialog to start the installation process.
P.S. If you want to try the new themes, don't look for "Metro", they're filed under "Surface".
Advanced Installer is available via the InstallSite Shop at http://www.installsite.biz/advancedinstaller.htm