Dave wrote: > i have downloaded debian-9.4.0-amd64-DVD-1.iso > > when i double click on it, it says cannot open. the iso > debian-9.4.0-amd64-DVD-2 and iso debian-9.4.0-amd64-DVD-3 It's a disc image, you should just be burning it with whatever disc mastering software your mac has ... -- |_|O|_| Registered Linux user #585947 |_|_|O| Github: https://github.com/dpurgert |O|O|O| PGP: 05CA 9A50 3F2E 1335 4DC5 4AEE 8E11 DDF3 1279 A281