I haven't been able to find instructions for VCSA 6.7 that work. Below is the plugin-package.xml file contents:
root@marsvc67 [ /usr/lib/vmware-vsphere-client/plugin-packages/vsphere-client ]# cat plugin-package.xml
<?xml version="1.0" encoding="UTF-8"?>
<pluginPackage id="com.vmware.vsphere.client" version="6.7.0" name="Virtual Infrastructure" description="vSphere Client" vendor="VMware">
<metadata>
<property name="supportedServerVersions" value="6.0,6.5,6.6,6.7"/>
</metadata>
<bundlesOrder>
<bundle id="com.vmware.vsphere.client.inventoryviewer" />
</bundlesOrder>
</pluginPackage>
root@marsvc67 [ /usr/lib/vmware-vsphere-client/plugin-packages/vsphere-client ]#