Ah, ok, I see :)

I'll look into it.

What I don't understand is this part: " (and lose my carefully configured workspace layout) "

Textastic should restore all windows, their positions, sidebar content and open tabs/files when it is restarted.

Thanks for your suggestions. I'll think about it.

Well, the alert has three buttons: Yes, No, Always - if you press "Always", the warning won't come up again and it will be disabled in settings.

Warning on "Download Latest" is actually the default behavior. Maybe you disabled the warning? You can re-enable the warning on the bottom of the settings screen.

Do you have any idea why this happened? Can you reproduce the problem? The crash reports should be in ~/Library/Logs/DiagnosticReports/ - can you send them to me?

Mac OS X saves the application state in the folder ~/Library/Containers/com.textasticapp.textastic-mac/Data/Library/Saved Application State/com.textasticapp.textastic-mac.savedState

Deleting that folder would probably have fixed the issue.

Hmm, are you sure this would work and is allowed by Apple? If the installer is launched from within Textastic, wouldn't it inherit its sandbox and thus prevent Authorization Services from working? From the docs: "Important: The authorization services API is not supported within an app sandbox because it allows privilege escalation." See https://developer.apple.com/library/mac/documentation/Security/Reference/authorization_ref/Reference/reference.html

Do you know a sandboxed app on the Mac App Store that includes an installation package?

This should be fixed in Textastic 2.0.

Fixed in Textastic 2.0.