Many of these installers contain malware or keyloggers designed to steal your Instagram login credentials.
Log in using your Instagram credentials (Grids uses a secure login window that doesn't share your password directly with the developer). Final Verdict Grids for Instagram 7 for Mac Free Download
You might find websites offering "Grids 7 for Mac Full Cracked" or "Free License Keys." Many of these installers contain malware or keyloggers