Are you SURE you have read the instructions below?  They are fast and simple, and without them you may get an error message...

ClientTracker 6 desktop is designed to work well with Mac OSX X 10.9, 10.10, 10.11, 10.12, 10.13, 11, 12 and 13

• Please follow the simple instructions below    ...before you download and run the installer.

Follow the steps below to install. When finished, your Security & Privacy window should look like this:

Temporarily Disable GateKeeper’s Unidentified App Developer Prevention

1. Launch System Preferences from the Apple menu.
2. Choose “Security & Privacy” and then click the “General” tab, followed by clicking the lock icon in the corner to unlock the settings.
3. Look for “Allow applications downloaded from:” and choose “Anywhere.”
4. Accept the security warning and allow.
5. You can now install the ClientTracker Demo.
6. Once it's installed, you may want to restore your previous settings.

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Thank you for reading and following the instructions above!
Standard Install is in the Applications folder.

Additional Resources:

Training Videos

Online ClientTracker Manual