Is the vCenter update appliance used for updating or fresh install?

Hey all, I'm running vCenter Server Version 6.0.0 Build 2594327 which I installed as an appliance. I just downloaded VMware vCenter Server 6.0 Update 1b Appliance (build 3343019) and was told by support I can use this to update my vCenter to the updated version. I started the installation but there were no update options/questions; it looks to me like it's for a new install. Can I use this appliance to update my current vCenter or am I going to have to do a new install?

Thanks,

Joe B