Hi, I have downloaded several times the Blender 2.83 Beta fro Mac from blender.org but when I open the file for install it says that the file is damaged.
Cannot install the program so far.
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I have set the build bot to build new versions of Blender 2.83 for MacOS. It should be available for download from https://builder.blender.org/download/ very soon.
Hopefully this fixes your issue. If it hasn't, then it will require investigation by the developers and build bot maintainers.
Edit: You may also want to checkout the task that @Robert Guetzkow (rjg) listed just in cause it has something of use.