If you are running macOS 10.11.6, you have two main options: attempt to run a native version or use a virtualization method to run the more stable Windows version. Option 1: Try the Native macOS Version : Visit the 3uTools Download Page and click the : Open the downloaded file and double-click the package installer. Bypass Security
Upon first launch, 3uTools will prompt you to install a system extension for USB communication. Click "Install." 3utools for mac 10.11.6
If you cannot get 3uTools stable, do not despair. Your Mac 10.11.6 is not obsolete. Here are powerful alternatives: If you are running macOS 10