How to recover all files from 500GB external hard drive on a mac?

Help! I accidentally formatted my external hard drive and lost all my information on it. I haven't done anything to is since, so I hope it's not too late to recover my files. Among them were pictures, music, and other records. I have attempted to use stellar phoenix for mac, but wasn't successful.... show more Help! I accidentally formatted my external hard drive and lost all my information on it. I haven't done anything to is since, so I hope it's not too late to recover my files. Among them were pictures, music, and other records. I have attempted to use stellar phoenix for mac, but wasn't successful. I'm confused on how to use it.

Could someone help! I'd really appreciate it!
Update: Is there a free recovery software out there, and if you can give me some steps on how to use it.
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