The 'read-only' error indicates that you may have failed to extract the game, or have yet to place it in the applications folder.
1. Right click the GROVE zip file you downloaded
2. Use the archive utility to unzip the files.
3. Drag the GROVE app into your applications folder.
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If a developer verification error appears when attempting to run the game, follow these steps:
1. Open 'System Preferences'
2. Go to 'Security and Privacy'
3. Go to the 'General' tab, then at the bottom (above the lock), grant an exception for the 'GROVE' app and click 'Open Anyway'
- RegalBuster