[Koha] Update woes

I have already tried twice to update Koha 3.00.02 to 3.00.03 without apparent success (with hopes of sorting out my Amazon content problems). The first time I used the update instructions from the Debian installation files. The web installer never ran (though I'm not sure it was supposed to) and the version remained 3.00.02.012 on the 'About' page. For my second attempt, I tried a completely vanilla install of 3.00.03 with a brand new database. I then used a .sql backup file of my old database to populate the new database. Again, no web installer and no apparent update (or fix of Amazon functionality). Is there something I'm missing here? Emrys