I'll check the packaging, if i fail it its for a reason.
EDIT:Ok I've checked it, its a .rar file which means it's a compressed file which requires a certain few types of programs to open, those programs are
7-zip,
WinZip,
I recommend useing 7-zip. I fail this Decal pack because 1.The add-on isn't something you can open if you don't have a certain program listed above 2.The decals sorta look copy pasted but not badly done 3.No screenshot's.