Config files deleted after downloading new build

So I’ve been using 2.79 and today downloaded a new nightly build and copied it to the program files folder. To then open blender and discover my preferences are gone, configs are gone and looking at my \AppData\Roaming\Blender Foundation\Blender\2.79 folder it is completely empty as if the folder was deleted and recreated. (Windows telling my the folder was created this evening).
Also there was no option to “copy previous settings” as expected if when downloading a new version number.

Any thoughts why this has happened and if I can recover my settings? I have already tried HDD data recovery apps but to no avail.

Thanks

go to your older 2.78 files and copy startupt files from there manually

happy bl