Can't import CSL file on mac

Hi, I'm trying to import https://github.com/citation-style-language/styles/blob/af2adb5646724c3b6b6c77ba22d7d5ad95358aaa/harvard-coventry-university.csl in to my word (for mac) but it tells me that the file 'doesn't seem to be a CSL file'. Any ideas? Thanks, Lynne