After the Mac download was removed from the end of the list of available files a few weeks ago from the SLR site, I started to download the Optimal 4k download since it saves as a mp4 file. I have been downloading the h.265 version, and that does not play on a Mac through Quicktime nor will it play on an iPhone for VR viewing. Today, I tried to download both Optimal 4k files, the h.265 version and the h.264 one. It looks like the h.264 version works well. Issue resolved.