Download the theme, extract it on your desktop.
Now , download the themepatcher from the link that Danny provided Theme - How to Apply Custom Themes
, the 64 bit one. Run it as admin (Right click > run as admin). Patch all the three offered dll files, and restart your computer.
Open the themes folder from your desktop ... there should be one file folder named Concave7, containing two folders viz en-US and shell, and a windows visual style file. There is another windows theme files named Concave7. Copy the entire folder described first, and the theme file, and go to C:\Windows\Resources\Themes; nad paste the both there.
Come back to your desktop. Right click > personalize. In the resulting window , scroll a bit down and look for installed theme concave 7, it should be there already. Apply it, and see the changes.
There are more system components in that theme, but those are bit difficult to apply.