a python installer bundled with opencv and numpy and ...

all the other similar algorithms

is something you may not find easily.

You may look into Anaconda Distribution

But if that doesn't answer your need, it's better to install python and your required packages manually.

1. Install python 2.7 first: Python 2.7.18

2. Make sure you choose to add python to PATH variables

3. Open windows terminal and run this command python --version

4. You should see your python version, with the above link it should be Python 2.7.18

5. Go to PyPi and find your required packages, you should read through their changelog or their repository (or even search the web) to find which version dropped support for python 2.7 and install a version prior to that

6. Finally install the package using the pip command, for example for numpy the last version that supports python 2.7 is numpy 1.16.6, so we run the following command:

python -m pip install numpy==1.16.6

Ultimately, as said by @chepner it's best to use the newer versions of python, as they provide better security, performance, features and compatibility.

More information about installing packages at here