The “installer” seldom “hard-fails”…
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Please make sure you know your Shard. Ref: FAQ: How to find out what "shard" (cloud slice IDE URL) your Account / Location is on?
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Please login to the appropriate Shard IDE/API page and check under “My Locations” / “Installed SmartApps”.
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You may need to force delete the SmartApp there (but you will lose the Dashboard(s). You have the option of contacting Support@SmartThings.com to assist you if the SmartApp appears under My Locations, but does not appear under: “Automations” in the SmartThings mobile App.