New user of this fantastique software :) [Resolved]

[routeconverter]

Due to the quality of the video I cannot see that you're storing not in the root folder. And the error message says again "Permission Denied". I've tried it on my Mac and it's possible to write files with RouteConverter into the home directory.

Btw, the save dialog that comes up is completely different on my 10.11.6 OS X. Which version are you using?