I have noticed on my Lab-environment the plugins live here: C:\ProgramData\VMware\vCenterServer\cfg\vsphere-client\vc-packages\vsphere-client-serenity\com.emc.s3g.scaleio.vSpherePlugin-2.0.5014.0 ***this works!!***  but on my production server: E:\ProgramData\VMware\vCenterServer\cfg\vsphere-client\vc-packages\vsphere-client-serenity\com.emc.s3g.scaleio.vSpherePlugin-2.0.6035.0  note the e: drive vs. the c: drive.
ScaleIO v2.0-6035.0 Windows 2012 r2 datacenter vcenter 6.0.0, 3634793 (4) esxi 6.0.0 3620759  Tasks completed  Register ScaleIO plugin Added template to the vcenter environment  In the server log it says:com.emc.ecs.vSpherePlugin.uiServices.installWizard.InstallWizardServiceImpl stateForView= DeploymentStateForView{deploymentState='NO_DEPLOYMENT_EXIST', isNewSystem=null, failedOnClusterReconfigure=false}  Any ideas? 
unable to find sdc install file