Rift lite installer doesn't open on osx High sierra

I have a free Rift Filter Lite (avid account) but impossible to get the installer working. I only get a list of letter and numbers when I douvle click on it.
Can you help me ?

I solve my problem. I had to add .zip at the end of the file name

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Sorry for this – we’ve seen this pop up in Firefox from time to time and haven’t determined exactly why