Mac security blocked the installer?
Apple blocks unsigned scripts from the internet. That is normal — not malware.
Fix: open the DMG → right-clickInstall GhostChat.command (or Install GhostChat.app) → Open → click Open again.
Or use Terminal (paste after opening the DMG): VOL="/Volumes/GhostChat"; xattr -cr "$VOL"/*; bash "$VOL/install-mac.sh" "$VOL" “Damaged” app? Same fix signs GhostChat, or drag to Applications then run the Terminal line above with /Applications/GhostChat.app.