Pabot does have install dependency for rf > 3.2 or something similar so there definitely should be robot executable but …
On certain sort of environments (like finance) - creating / installing executables at install time like pip does be disabled. Pabot 100% relies on these executables to be present and if they are not, pabot execution will fail. As alternative, pabot should get it’s interpreter and call that external robot with python -mrobot.run ... but there’s no such code in pabot. Only way to get this working is to patch few files in pabot manually
your PATH environment does not contain Scripts folder so any executables generated when python packages are available by default. How to fix, depends on how/where your python is installed. Easiest way would be to utilize virtual env of your choice.