Updated installation instructions. (#5988)

Author: miguelalonsojr

docs/Installation.md

@@ -26,14 +26,15 @@ Consequently, to install and use the ML-Agents Toolkit you will need to:
 
 - Install Unity (2022.3 or later)
 - Install Python (3.10.12 or higher)
-- Clone this repository (Optional)
+- Clone this repository (Recommended for the latest version and bug fixes)
   - __Note:__ If you do not clone the repository, then you will not be
   able to access the example environments and training configurations or the
   `com.unity.ml-agents.extensions` package. Additionally, the
   [Getting Started Guide](Getting-Started.md) assumes that you have cloned the
   repository.
 - Install the `com.unity.ml-agents` Unity package
 - Install the `com.unity.ml-agents.extensions` Unity package (Optional)
+- Install the `mlagents-envs`
 - Install the `mlagents` Python package
 
 ### Install **Unity 2022.3** or Later
@@ -44,13 +45,22 @@ enable you to manage multiple Unity versions.
 
 ### Install **Python 3.10.12** or Higher
 
-We recommend [installing](https://www.python.org/downloads/) Python 3.7.
+We recommend [installing](https://www.python.org/downloads/) Python 3.10.
 If you are using Windows, please install the x86-64 version and not x86.
 If your Python environment doesn't include `pip3`, see these
 [instructions](https://packaging.python.org/guides/installing-using-linux-tools/#installing-pip-setuptools-wheel-with-linux-package-managers)
-on installing it.
+on installing it. We also recommend using [conda](https://docs.conda.io/en/latest/) or [mamba](https://github.com/mamba-org/mamba) to manage your python virtual environments.
 
-### Clone the ML-Agents Toolkit Repository (Optional)
+#### Conda python setup
+
+Once conda has been installed in your system, open a terminal and execute the following commands to setup a python 3.10 virtual environment
+and activate it.
+
+```shell
+conda create -n mlagents python=3.10 && conda activate mlagents
+```
+
+### Clone the ML-Agents Toolkit Repository (Recommended)
 
 Now that you have installed Unity and Python, you can now install the Unity and
 Python packages. You do not need to clone the repository to install those
@@ -153,17 +163,29 @@ To install the `mlagents` Python package, activate your virtual environment and
 run from the command line:
 
 ```sh
-python -m pip install mlagents==0.30.0
+cd /path/to/ml-agents
+python -m pip install ./ml-agents-envs
+python -m pip install ./ml-agents
 ```
 
-Note that this will install `mlagents` from PyPi, _not_ from the cloned
+Note that this will install `mlagents` from the cloned repository, _not_ from the PyPi
 repository. If you installed this correctly, you should be able to run
 `mlagents-learn --help`, after which you will see the command
 line parameters you can use with `mlagents-learn`.
 
+**NOTE:** Since ML-Agents development has slowed, PyPi releases will be less frequent. However, you can install from PyPi by executing
+the following command:
+
+```shell
+python -m pip install mlagents
+```
+
+which will install the latest version of ML-Agents and associated dependencies available on PyPi. Note, you need to have the matching version of
+the Unity packages with the particular release of the python packages. You can find the release history [here](https://github.com/Unity-Technologies/ml-agents/releases)
+
 By installing the `mlagents` package, the dependencies listed in the
 [setup.py file](../ml-agents/setup.py) are also installed. These include
-[PyTorch](Background-PyTorch.md) (Requires a CPU w/ AVX support).
+[PyTorch](Background-PyTorch.md).
 
 #### Advanced: Local Installation for Development