Here we'll post some useful guides for doing things, and workarounds for known issues.

Running the Mac Version

The Mac version of Mannequin is currently unsigned (because I don't have the money to pay that $99 Developer Program subscription fee), so you'll need to disable Gatekeeper in order to run Mannequin in your Mac.

I'm quite sure there's nothing wrong with the app, but I should remind you that disabling Gatekeeper increases the security risk of your Mac. Please do this with care, and remember to re-activate Gatekeeper again after running Mannequin for the first time. Or, just wait for the signed version if you have the patience (hopefully it will be available around September-October).

Step-by-step:

1. Navigate to System Preferences from the Apple Menu or from the Dock.
2. Click on the Security & Privacy preference pane, under the Personal header.
3. In the Security & Privacy pane, click on the Lock icon on the bottom-left.
4. Enter your Mac's username and password and click Unlock.
5. Click the radio button next to Anywhere.
6. When prompted, click Allow From Anywhere. You can now install any compatible application on your Mac without the installation being blocked.
7. Run Mannequin.
8. IMPORTANT: After running Mannequin, follow the above instructions until step 5, and click the radio button next to Mac App Store and identified developers. Then close the System Preferences window. This wil re-enable Gatekeeper in order to restore protection from unwanted apps running on your Mac.