It's a little easier than compiling from source to run unsigned on OSX (for most people; this might not apply to the work laptop case from the OP, but in case anyone else finds this...)
You can also run the precompiled software on osx by opening Finder > Applications (or whereever you installed it), right clicking the Tiled icon > left clicking `Open`, and then telling it "yes I really meant to open this software". You may have to try running it twice for the OS to give you the correct dialog, after which it's trusted.
Note you *can't* open the app with a doubleclick or the return key to get this dialog the first time (the normal "run this app" gestures; more details).