From the official HP help page:
https://developer.palm.com/support/applicationupdate
Installing the Updates after July 23rd
1. For users of ALL webOS devices:
a. Open the “Date & Time” app on your device.
b. Set “Network Time” to Off.
c. Set the date to July 1, 2013.
d. Open the App Catalog
e. Type “App Catalog Update” in the search filed, and select “Enter” on the keyboard.
f. Tap the “App Catalog Update” app to display the details page.
g. Tap “Download for Free” to download and install the app.
h. Return to the “Date & Time” app.
i. Set the date back to the current date.
j. Set “Network Time” to On.
I believe this means you need to bypass First Use - get the certificate - then sign up for your profile...