first of all to "install" it just simply move the downloaded (and unpacked) folder to your documents-> rainmeter folder, restart rainmeter and it should be there. select the ones you want, save their positions and you're done.
second problem is the buttons not working. in most cases this is a simple fix:
go to the folder containing the "skin" in this case what's the simplest is the "bookmarks" and the "applications" dock go to the ".ini" file right click and open in notepad(or some other text editor) there you need to replace the application paths to the paths on your PC go to the shortcut of the program you wish to run Right click -> properties -> target and just copy what is in that field (or find the program's directory yourself) and replace it in the .ini file
ex: it was originally ["C:\program files\mozzila\firefox.exe"] ... changed it to my own path like so ["C:\program files(X86)\firefox\firefox.exe"] you use whatever your path is. Save restart Rainmeter (or restart PC) and it should work.. same with any other path/shortcut you can change it to whatever you wish. this way you can fix / edit most of the skins buttons.