Firmware Update for HP P1102w on MAC

Hi.

Intro information:

I'm running OSX 10.8.5 and I be hable to do my printer work downloading software for OSX 10.7. Now the printer is working with USB connection and Wireless connection, but I can't eneble the e-print center. The printer can't connect to the eprint service by internet. 

The question is:

I can't update HP P 1102w firmware on Mac. I have the 20130213 Firmware and the website shows me that the updated firmware is the 20130703.

I downloaded the LJP1100_P1560_P1600_FW_Update.dmg but my mac blocked the firmware setup.

Can anyone help me please?

Thanks.

Claudio