Fix front page version number

Say we start support at node 8
Remove old alternative install (not needed)

Author: Dave Conway-Jones

docs/getting-started/installation.md

@@ -49,18 +49,7 @@ Once installed, you are ready to [run Node-RED](running).
 
 ----
 
-### Alternative install methods
-
-#### Download a release
-
-You can download the latest release from [here](https://github.com/node-red/node-red/releases/latest).
-The zip contains a top-level folder called `node-red-X.Y.Z` where `X.Y.Z` is the
-version number. Once extracted, from within that top-level folder, run the
-following command:
-
-    npm install --production
-
-#### For Development - from GitHub
+### For Development - from GitHub
 
 Running the code from GitHub is only intended for users who are happy to be using
 development code, or for developers wanting to contribute to the code.

docs/hardware/raspberrypi.md

@@ -7,7 +7,7 @@ The recommended way to install Node-RED on Pi is to use our script below, howeve
 
 You can upgrade Node-RED by re-running the script.
 
-Node-RED no longer supports Node.js 4.x or earlier. The last version to support 4.x was 0.19.6.
+Node-RED no longer supports Node.js 6.x or earlier. The last version to support 6.x was 0.19.6.
 
 ### Install / Upgrade
 
@@ -17,7 +17,7 @@ that doesn't have Node-RED already installed, you can install or upgrade using t
     bash <(curl -sL https://raw.githubusercontent.com/node-red/raspbian-deb-package/master/resources/update-nodejs-and-nodered)
 
 On really minimal Debian installs you may need to run `sudo apt-get install build-essential` before
-running the script so that the serialport builds and installs OK. This is optional.
+running the script so that the serialport builds and installs correctly. This is optional.
 
 #### Script Description
 
@@ -173,7 +173,7 @@ appear between node and red.js.
     node --max-old-space-size=256 red.js
 
 This option limits the space it can use to 256MB before cleaning up. If you are
-running nothing else on your Pi you can afford to increase that figure to 256
+running nothing else on your Pi you can afford to increase that figure to 512MB
 and possibly even higher. The command `free -h` will give you some clues as to
 how much memory is currently available.
 

index.html

@@ -7,7 +7,7 @@
             <div class="content">
                 <h1>Node-RED</h1>
                 <h2>Flow-based programming for the Internet of Things</h2>
-                <p>Latest version: <a href="https://www.npmjs.com/package/node-red"><span class="node-red-latest-version">v0.20.4</span> (npm)</a></p>
+                <p>Latest version: <a href="https://www.npmjs.com/package/node-red"><span class="node-red-latest-version">v0.20.5</span> (npm)</a></p>
                 <!-- <img src="images/node-red-title-flow.png" /> -->
             </div>
         </div>