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Windows pip installation guide (#4736) 

* added initial steps

* fixing link

* python3 -> python

* remaining steps

* steps updated

* Update docs/intro/install.rst

Co-authored-by: Adrián Chaves <adrian@chaves.io>

* added link to Visual Studio

* removed 'install V'

* Update docs/intro/install.rst

Co-authored-by: Adrián Chaves <adrian@chaves.io>

Co-authored-by: Adrián Chaves <adrian@chaves.io>
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@ -12,6 +12,7 @@ Supported Python versions
Scrapy requires Python 3.6+, either the CPython implementation (default) or
the PyPy 7.2.0+ implementation (see :ref:`python:implementations`).
.. _intro-install-scrapy:
Installing Scrapy
=================
@ -29,13 +30,13 @@ you can install Scrapy and its dependencies from PyPI with::
pip install Scrapy
We strongly recommend that you install Scrapy in :ref:`a dedicated virtualenv <intro-using-virtualenv>`,
to avoid conflicting with your system packages.
Note that sometimes this may require solving compilation issues for some Scrapy
dependencies depending on your operating system, so be sure to check the
:ref:`intro-install-platform-notes`.
We strongly recommend that you install Scrapy in :ref:`a dedicated virtualenv <intro-using-virtualenv>`,
to avoid conflicting with your system packages.
For more detailed and platform specifics instructions, as well as
troubleshooting information, read on.
@ -117,6 +118,27 @@ Once you've installed `Anaconda`_ or `Miniconda`_, install Scrapy with::
conda install -c conda-forge scrapy
To install Scrapy on Windows using ``pip``:
.. warning::
This installation method requires “Microsoft Visual C++” for installing some
Scrapy dependencies, which demands significantly more disk space than Anaconda.
#. Download and execute `Microsoft C++ Build Tools`_ to install the Visual Studio Installer.
#. Run the Visual Studio Installer.
#. Under the Workloads section, select **C++ build tools**.
#. Check the installation details and make sure following packages are selected as optional components:
* **MSVC** (e.g MSVC v142 - VS 2019 C++ x64/x86 build tools (v14.23) )
* **Windows SDK** (e.g Windows 10 SDK (10.0.18362.0))
#. Install the Visual Studio Build Tools.
Now, you should be able to :ref:`install Scrapy <intro-install-scrapy>` using ``pip``.
.. _intro-install-ubuntu:
@ -268,4 +290,6 @@ For details, see `Issue #2473 <https://github.com/scrapy/scrapy/issues/2473>`_.
.. _zsh: https://www.zsh.org/
.. _Anaconda: https://docs.anaconda.com/anaconda/
.. _Miniconda: https://docs.conda.io/projects/conda/en/latest/user-guide/install/index.html
.. _Visual Studio: https://docs.microsoft.com/en-us/visualstudio/install/install-visual-studio
.. _Microsoft C++ Build Tools: https://visualstudio.microsoft.com/visual-cpp-build-tools/
.. _conda-forge: https://conda-forge.org/