I currently have version 3.2.1 and what to update it to the latest.
I follow "click here in order to upgrade" link and get the message "New releases of the following components are avalable ... " with KNIME and KNIME store 3.2 and 3.3 listed there.
I press "Yes" (I want to upgrade) but then I get mesage "No updates were found"(some times it tryes to connect to servers, sometimes message is instant)
I do have 3.3 update among avalable software sites in preferences list.
You also may want to check that the links for the 3.2 update sites are removed from the preferences. If you use the workspace with an older version after having upgraded to 3.3 the old update site links are sometimes added back leading to the message you encounter.