I just tried to install the newest WP on my MacBook Pro. On opening WhatPulse 2.3.1.mpkg it says “WhatPulse 2.3.1.mpkg can’t be opened because it is from an unidentified developer”.
I haven’t seen this message any time before (Mac user since 7 years or something). Is this something I could fix myself, or may this have anything to do with for instance (lack of) support of Mavericks?
That message is from Apple’s Gatekeeper feature, which is new since Mountain Lion. You can still open apps with a right click → ‘Open’ (then probably another ‘Open’ when it asks you if you’re sure)
I’m surprised you say you haven’t seen this messages before, because half of the OS X apps out there are not signed.
Ah that’s why I didn’t know the message already; I skipped Mountain Lion I have been using Mavericks since a month or something. Guess I only used signed installers then