New developer - need help

[Gtownfan]

Hi

I am wondering if someone can help me or point me in the right direction.

I am having someone create an app for me. They just sent me the first beta of the app. They sent an ipa file and prior to sending they needed my UDID so I sent that to them. I then downloaded the ipa file and tried to install it through iTunes. I get the error message that it could not install.

Am I missing a step? Do I need to register my phone on the developer network or because he entered my UDID that works?

I am on a windows PC so not sure if there is anything on can do on the windows pc to get it to install or if I need a Mac. Any help is appreciated.

Brian