Merge pull request #237 from alugowski/install-clarify

Clarify installation instructions

Author: lmcinnes

README.rst

@@ -173,7 +173,7 @@ Easiest install, if you have Anaconda (thanks to conda-forge which is awesome!):
 
     conda install -c conda-forge hdbscan
 
-PyPI install, presuming you have sklearn and all its requirements (numpy and scipy) installed:
+PyPI install, presuming you have an up to date pip:
 
 .. code:: bash
 
@@ -182,41 +182,42 @@ PyPI install, presuming you have sklearn and all its requirements (numpy and sci
 Binary wheels for a number of platforms are available thanks to the work of
 Ryan Helinski <[email protected]>.
 
-If pip is having difficulties pulling the dependencies then we'd suggest installing
-the dependencies manually using anaconda followed by pulling hdbscan from pip:
+If pip is having difficulties pulling the dependencies then we'd suggest to first upgrade
+pip to at least version 10 and try again:
 
 .. code:: bash
 
-    conda install cython
-    conda install numpy scipy
-    conda install scikit-learn
+    pip install --upgrade pip
     pip install hdbscan
 
-For a manual install get this package:
+Otherwise install the dependencies manually using anaconda followed by pulling hdbscan from pip:
 
 .. code:: bash
 
-    wget https://github.com/scikit-learn-contrib/hdbscan/archive/master.zip
-    unzip master.zip
-    rm master.zip
-    cd hdbscan-master
-
-Install the requirements
+    conda install cython
+    conda install numpy scipy
+    conda install scikit-learn
+    pip install hdbscan
 
-.. code:: bash
 
-    sudo pip install -r requirements.txt
-    
-or
+For a manual install of the latest code directly from GitHub:
 
 .. code:: bash
 
-    conda install scikit-learn cython 
+    pip install --upgrade git+https://github.com/scikit-learn-contrib/hdbscan.git#egg=hdbscan
 
-Install the package
+
+Alternatively download the package, install requirements, and manually run the installer:
 
 .. code:: bash
 
+    wget https://github.com/scikit-learn-contrib/hdbscan/archive/master.zip
+    unzip master.zip
+    rm master.zip
+    cd hdbscan-master
+    
+    pip install -r requirements.txt
+    
     python setup.py install
 
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