Probably something went wrong with the download. The filename should end in .dmg, not .dm. It should be 123, 693, 418 bytes long. (It might show as something different, e.g. ¡°123.7 MB on disk¡± in summaries, but check the Get Info results for the exact length)
You could try downloading it again from here:
Bob
On Jul 5, 2017, at 2:28 AM, peter.hambidge@... [jmriusers] <jmriusers@...> wrote:
I am trying to install the latest jmri version on my MacOS, Sierra version 10.12.5.
Download is good but get this message when attempting to install.
" jmri.4.6-R81496dc.dn no mountable file system"
What is the computer illiterate guy missing?
--
Bob Jacobsen
rgj1927@...
Bob Jacobsen