I did "ant jarbundler". It created dist/KoLmafia-17.6.app (which is a folder)
I went to sourceforge and created a directory "Test"
I selected KoLmafia-17.6.app for upload. It created KoLmafia-17.6.app.zip
I downloaded KoLmafia-17.6.app.zip and unzipped it into KoLmafia-17.6.app
I clicked on the KoLmafia-17.6 app.
El Capitan popped up a window saying "Verifying KoLmafia-17.6"
It then said
"KoLmafia-17.6" is damaged and can't be opened. You should move it to the Trash.
[Safari downloaded this file today at 1:13 PM from sourceforge.net]
I control-clicked on the app
I clicked Open in the pop-up
I got the same error
That certainly didn't work the way Bale's linked page said it would work. That document did say:
Note: You can also grant an exception for a blocked app by clicking the “Open Anyway” button in the General pane of Security & Privacy preferences. This button is available for about an hour after you try to open the app.
To open this pane, choose Apple menu > System Preferences, click Security & Privacy, then click General.
Now, I am running El Capitan, not Sierra.
I went to Apple menu > System Preferences, click Security & Privacy, then click General.
I see a set of radio buttons:
Allow apps downloaded from:
o Mac App Store
o Mac App Store and identified developers
o Anywhere
I switched to the last button.
It popped up a window that said:
Choosing "Anywhere" makes your Mac less secure.
This selection will be reset automatically if unused for 30 days. Instead, you can allow an individual application from an unknown developer by control-clicking its icon and choosing "Open".
Yeah, right. not.
I clicked "Allow from Anywhere".
I clicked on the KoLmafia-17.6 app.
It popped up a window saying "KoLmafia-17.6 is an application downloaded from the Internet. Are you sure you want to open it?"
I clicked yes.
It opened successfully.
I went back to Security & Privacy and reset to "Mac App Store and identified developers".
I clicked on the KoLmafia-17.6 app.
It opened up with no problem.
Conclusions:
1) control-clicking the app icon and saying "Open" does not successfully bypass the security. Apple's dialog claims it works, but it did not work.
2) On El Capitan, changing security to allow anything allows opening the app - and having done so, it persists even after restoring the security.
3) I have no idea if this app is now allowed permanently or temporarily.
And lastly,
4) Bale's link suggests that Sierra's security page provides a (temporary) button to allow opening a rejected ash.