Someone else made this theme originally, but it was green and black, and really broken, so I decided to recode most of it myself using resource hacker and paint.net.
Same with the Rainmeter, and the icons are straight from Windows 10, with some modifications, though some things like the folder are still bugged.
And yes that is a red selection rectangle.
Please do not pm me asking for it, installation requires modifying Windows 8.1 Base Files and stuff in System 32 .