I have a MacBook Air running OSX 10.9.5 I seem to have trouble loading software - I've had it with various software, though at the moment it's with Android File Transfer. I download the dmg file to my hard disk. I click on the dmg file and see the window in which I drag the Android File Transfer icon to my applications directory. I drag it. It says it is installing the software. Then I click on the application in my applications folder to open it and it says "Android File Transfer is an application downloaded from the internet, are you sure you want to open it?" I say "okay" (see attached screenshot of that) Then it says "No android device found. Please connect your Android device with a USB cable to get started." I connect my phone. But it can't find my phone, and continues to tell me "no android device found." If I look at the list of devices in the left hand of my Finder window, Android shows up as an external device, and my phone does not show up at all (see third attached screenshot). If I click on "Android" as an external device, I get the list of files you can see in the fourth attached screenshot. If I then click on "android" I get another message telling me there is no android device connected. I have had this problem before with other downloaded software. I'm pretty sure it has something to do with how I am downloading and (trying to) install software - not an android problem, I don't think. What am I doing wrong? Thank you for your help!