macOS
Method 1: Homebrew (Recommended)
brew install --cask --no-quarantine ilhan-mstf/tap/omnitool
Method 2: Manual Bypass
Download the .dmg, move to Applications, then Right-Click > Open to bypass the developer warning.
Method 3: Terminal
If blocked, run this to un-quarantine:
sudo xattr -rd com.apple.quarantine /Applications/Omnitool.app