Help google maps "invalid package installer"

[boomerangboom]

Hi all! I'm trying to install google maps from the market on my moms new fascinate. It downloads it but when it goes to install it says "invalid package installer". She says the phone is up to date and says no updates available. Any ideas to what is going on?? I emailed her an older version of maps and we are going to try to install it tonight. We are doing all this over skype so sorry I cant provide more hands on details. Thanks!