You have to press ctrl + cmd and click on sleepyhead and an option to open or not will appear. It is Apple's inbuilt system to stop unwanted downloads.
I had that same problem too.....
Once open, with SD card reader via USB stick or other, download SD card info with Sleepyhead. Unless of course your MacAIr has SD card reader-mine dose not.
Beginner's Guide to SleepyHead
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