download_and_install.md

-## Download ##
 
-You must have a git client installed on your system, then run in a terminal:
+# Download #
+
+Whatever your operating system, **git** is needed to download the
+user version of LMGC90.
+
+## Linux and MacOS ##
+
+If **git** is not already install, use your package manager to install it.
+
+### Installing git ###
+
+- Ubuntu/Debian
+
+In a terminal run:
+
+```shell
+sudo apt-get install git
+```
+
+- OpenSuse
+
+In a terminal run:
+
+```shell
+sudo zypper install git
+```
+
+- CentOS
+
+In a terminal run:
+
+```shell
+sudo yum install git
+```
+
+- MacOS
+
+In a terminal run:
+
+```shell
+sudo port install git
+```
+
+### Downloading LMGC90 ###
+
+In a terminal run the following commands:
 
 ```shell
 export GIT_SSL_NO_VERIFY=True
 git clone https://git-xen.lmgc.univ-montp2.fr/lmgc90/lmgc90_user.git
 ```
+
 This should create a directory *lmgc90_user*. Once the previous line has been run, all next ```git``` commands should be run from this *lmgc90_user* directory.
 
 To update to the latest state run from a terminal in your *lmgc90_user*:
+
 ```
 git pull origin master
 ```
 
 
-###### Note on security: ######
+#### Note on security: ####
 
 There are some securities issues in using the:
+
 ```shell
 export GIT_SSL_NO_VERIFY=True
 ```
 The proper way to do that would be to get the self-signed certificate in the PEM format of our website from your web navigator (in Firefox you can do that with *Firefox/Preferences* then in tab *Advance* thumbnail *Certificates* clic on *Display certificats* button ; find our certificates and clic *export* button and save the file wherever you want). Then in your *lmgc90_user* directory run:
+
 ```
 git config http.sslCAInfo path_to_your_pem_file
 ```
 
-## Compile ##
+## Windows ##
+
+### Installing git ###
+
+If you do not have a **git** client already installed on your system, download it
+from here [here](https://git-scm.com/downloads) and then install it.
+
+### Downloading LMGC90 ###
+
+
+
+# Install #
 
-Please read the [README.md](https://git-xen.lmgc.univ-montp2.fr/lmgc90/lmgc90_user/blob/master/README.md) file here
-or in your version.
+Please read the [README.md](https://git-xen.lmgc.univ-montp2.fr/lmgc90/lmgc90_user/blob/master/README.md)
+file here or in your version.