Disclaimer: I've already found a work-around for this problem. I just wanted to let everybody else with a similar problem know how to fix it and I hope that maybe there will be a fix in a later version.
I'm running OS X El Capitan (10.11.16). The new Fitbit OS Simulator (v. 0.5.8) crashes directly after double-clicking on the icon after downloading (my guess is, this is a bug only for the first launch) and throws a series of exceptions, the first (and main one) being:
Error ENOENT: No such file or directory: mkdir '$Username/Library/Application\ Support/Fitbit\ OS\ Simulator/user-settings' ($Username being the username on my Macbook).
I managed to fix it with manually creating the said directory on my Macbook, but I guess a fix in a later version of Fitbit OS Simulator would be nice 🙂
I used Safari at the beginning (I'm just fiddling around with Fitbit Studio / Fitbit OS Simulator for two days now), now I switched to Chrome - Mainly because this was the only browser I managed to upload custom images into my resource/ folder.
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