Odd problem copying an App

[RichardMurison]

I work with a developer who is developing a small Mac App using X-Code. He sends me builds of the App to evaluate in the form of a small zip file attached to an e-mail.

I need to test the App on two Macs. I receive the e-mail on Mac #1, download the attachment to my desktop, unzip it and run it.

If this is satisfactory I want to run it on Mac #2. If I copy the App itself to the desktop of Mac #2 it will not run. Instead, I must copy the zip file, and extract the App from it on Mac #2. Then it runs fine.

Does this make sense to anyone? The developer seems unable to explain it.

 

[cradom]

Are you getting an error message like "this App cannot run because it's damaged" or something like that?
Check your Gatekeeper settings under Security and Privacy in System Preferences.