Unable to add systemcore from Unity Package manager per your directions on page

[Concresent]

Engine Version Used
'Unity 2022.3.58'

Describe the bug
Trying to install systemcore through Unity Package Manger Add Package from Git URL but Unity fails to download it every time.

** Unity Error Message
[Package Manager Window] Error adding package: https://github.com/heathen-engineering/SystemCore.git?path=/com.heathen.systemcore.
Unable to add package [https://github.com/heathen-engineering/SystemCore.git?path=/com.heathen.systemcore]:
No 'git' executable was found. Please install Git on your system then restart Unity and Unity Hub
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()