Please check the role of the user you are trying to view Permissions of the content block with - only administrators and owners should be able to view the permissions for the widget.
It seems there is a problem with your upgrade as normally there is no limitation by license to view the Granular Permissions as administrator.
The best way to verify whether the upgrade was successfully is to check the version of the project in the Version & Licensing page. You can also check whether the build number for the modules in the SystemConfig is the same as in the Version & Licensing page. Also please take a look at the UpgradeTrace.log located in ~App_Data\Sitefinity\Logs and check whether there are errors after the upgrade.