Where in the Web UI?
http://img594.imageshack.us/img594/4650/3h11.jpg
Before update #55 I have seen this ""Install and Update Parallels Products" the upgrade to "11.5.30 (testing)".
In "System overview" box click "Change settings". You'll be taken to updates settings page. There select "Early adopter release". See also here. Sorry, but I can't make a screenshot right now to show you.
Then you'll be notified about the 11.5.30 release within a week. However you can go to installer manually and you'll be able to upgrade to 11.5.30 right away there.
The fact that you previously saw an option to upgrade is due to a bug that was fixed by MU#55.
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