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Error if there's an update available but the app's on a read-only volume #186
I think it makes sense to only error once we know that it matters, i.e., that there's an update available. Otherwise it'd just be an annoying error when the user first downloads the app.
The read-only volume check is taken from Sparkle: https://github.com/sparkle-project/Sparkle/blob/3a5c620b60f483b71f8c28573ac29bf85fda6193/Sparkle/SUHost.m#L178-L183