I want to put in a suggestion. I just updated to the CentOS version of Turbonomic and then today updated to Version 5.8.1 as noted in the screen shot. After the update and subsequent login I checked for updates again, but everything is current. The suggestion is that if there are no updates have the UPDATE button grayed out not available. This is how it was previously I believe on earlier releases.
Update button available but no further updates â€“