What is your operating system?
downloading acrobat trial wrote:
The application could not be installed because the installer file is damaged. Try obtaining a new installer file from the application author.
The message is pretty clear: this install file is damaged, probably during the download. Try using the offline installer from http://get.adobe.com/reader/enterprise/
The above download link is for Adobe Reader. Your userid is "downloading acrobat trial"; so you actually want to download Acrobat?