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Arduino 1.8.5 update, error on loading to Uno Answered

Hi. I have just updated to 1.8.5 from 1.0.5 on MAC and get error message: "Ileagal files found". I have not uninstaled old version yet as that still works. Is the old version the problem now? Also the new version will not stay "unzipped" on the dock.

Thanks in advance for your help.