Registered on steampowered.com.
Downloaded the steam app, when starting it, just an empty app shows up :
When trying to run the /Applications/Steam.app/Contents/MacOS/steam_osx
manually here's the output :
[2016-12-26 14:55:08] Verifying installation...
[2016-12-26 14:55:08] Verification complete
CHIDDeviceListSDL(): Couldn't load libSDL2-2.0.0.dylib, not enumerating devices
Errors in public/subpanelwelcomeintro.res:
error loading file 'public/subpanelwelcomeintro.res', no such file
Errors in public/subpanelwelcomecreatenewaccount.res:
error loading file 'public/subpanelwelcomecreatenewaccount.res', no such file
Errors in public/subpanelwelcomecreatenewaccountaccountname.res:
error loading file 'public/subpanelwelcomecreatenewaccountaccountname.res', no such file
Errors in public/subpanelwelcomecreatenewaccountemail.res:
error loading file 'public/subpanelwelcomecreatenewaccountemail.res', no such file
Errors in public/subpanelwelcomecreatenewaccountnamecollision.res:
error loading file 'public/subpanelwelcomecreatenewaccountnamecollision.res', no such file
Errors in public/subpanelwelcomecreatingaccount.res:
error loading file 'public/subpanelwelcomecreatingaccount.res', no such file
[2016-12-26 14:55:09] Background update loop checking for update. . .
[2016-12-26 14:55:09] Checking for available updates...
Errors in public/subpanelwelcomecreatenewaccountprintdetails.res:
error loading file 'public/subpanelwelcomecreatenewaccountprintdetails.res', no such file
OS X El Capitan 10.11.6