...Just copy all the three files in the Toolbar folder to 
{IDM installation directory}\Toolbar\

generally,

C:\Program files (x86)\Internet Download Manager\Toolbar\

or

C:\Program files\Internet Download Manager\Toolbar\

..now restart IDM (if already open otherwise start it) and then choose the "8" option from View > Toolbar > 8
				
				...ENJOY!!!!!

NOTE: This toolbar icon only supports large icon set, so be sure to set your toolbar view to "Large icons". You can do this by navigating to View > Toolbar > Large Icons



windows 8 toolbar for IDM by bswas
windows 8 icon credit to dakirby309's windows 8 icons- http://dakirby309.deviantart.com/art/BETA-DOWNLOAD-Metro-UI-Icon-Set-MAJOR-UPDATE-337615633