why any download can be opened in Solidworks?

I have Solidworks 2016, and every model I download in here (.sldprt) doesn't open. There's a message thats says, "Can not open .... future version" please help.

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It means the model was created in the 2017 or 2018 release. The 2016 version will not open these "future versions".
Your best option is to download a generic version of the file (step, parasolid, iges, sat...etc.), or ask someone here to convert it to one of those formats.

 
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