If you do *NOT* want to do the automatic update, and don't want to keep hitting "Install Later" then the following did appear to work for me.
First, you must make sure you have the
preware jar stuff installed on your PC, and can navigate it to get a command prompt on your TP, (or alternatively, can ssh in). I am not covering that here, search for it on these forums and on the web.
Then, when you have a shell on your TP, do the following:
cd /usr/bin
chmod -x UpdateDaemon
and then reboot.
You may also need to do the remount as suggested here:
http://forums.precentral.net/webos-d...os-update.html
and elsewhere. I already had my TP in developer mode so that may have obviated the requirement to remount the partition rw.
Anyhow, I rebooted, and voila! No further prompts to update. I am now happy *NOT* updating to 3.0.4 where the things I want to work won't.
Hope that helps.
Kind regards
D.