Can i get a software upgrade on the week-long trial? It didn't download it last night.

Yes you can. It doesn't update the software on the 1st call that's for certain, there is an option somewhere in the menu's (sorry, I'm @ work ATM so I can't tell you where) to Make daily call now - that should cause the 2.5.2 software to get downloaded. AFAICR this takes up to 2 hours to download & install so don't panic if it seems to take ages