Damaged can't be opened.

[Ben]

I was provided the free upgrade link to download ACDSee Photo Studio for Mac version 4. I downloaded the file. Moved the app symbol to Applications folder and got the following message when i clicked on the app to open the file: “ACDSee Photo Studio” is damaged and can’t be opened. You should move it to the Trash." I downloaded the file again.....same thing? What should I do?