Sketchup viewer keeps crashing 2015 in yosemite (mac)

I’ve download sketchup viewer 2015 in yosemite but when I try and open a skp doc it tells me the file was created in a newer version of sketchup and to download the latest version. I tried this to no avail. Any suggestions??

It works fine for me. Can you post the file you were trying to open so we can see whether there is an issue with that particular file?

Sorry, can’t post the file because of NDA rules. It’s working now, albeit shakily. Thanks for the reply though!