Update url for downloading the latest build

Author: mokun

index.html

@@ -448,13 +448,12 @@ <h6>(2-D blueprint of a Mars outpost with connected modules. Image courtesy of G
 							<header>
 								<h2>Download</h2>
 							</header>
-							<p> mars-sim is available for free. Download the latest v3.1.0-preview today. Go to the page below:
+							<p> mars-sim is available for free. Download the latest build today at:
 
 							 <ul>
 								<li>i.
-								<a href="https://sourceforge.net/projects/mars-sim/files/latest/download" rel="nofollow"><img alt="Download Mars Simulation Project" src="https://a.fsdn.com/con/app/sf-download-button"></a>
-								<li>ii. 
-								<a href="http://mars-sim.sourceforge.net/guide/msp_userguide.pdf">v3.06 User Guide</a></li>
+								<a href="https://github.com/mars-sim/mars-sim/releases" rel="nofollow"><img alt="Download Mars Simulation Project" src="https://a.fsdn.com/con/app/sf-download-button"></a>
+
 							<!-- 
 								<li>ii.  
 								<a href="	
@@ -478,19 +477,15 @@ <h2>Download</h2>
 							-->		
 
 							  </ul>
-							<br/>
+							<p> Also, you may download the <a href="http://mars-sim.sourceforge.net/guide/msp_userguide.pdf">v3.06 User Guide</a>
+								as a reference.
+	
 
 
 							<p> Minimum Requirements :
 							<br/> 1. Dual Core Pentium/Celeron 1.5GHz or above
 							<br/> 2. 500 MB to 1.5 GB free RAM dedicated for running mars-sim
-							<br/> 3. 64-bit Oracle Java 8 (JRE or JDK 8u71 and higher) OR OpenJDK 8u71 with OpenJFX
-
-							<p> Known Limitations :
-							<br/> 1. In MacOS, the Tab bar does NOT work and will freeze mars-sim if clicking on it. Recommend using MacOS's style top menu to gain access to each Tool.
-							<br/> 2. In Linux, the spinning 3D Mars Globe has unwanted black shadow artifact.
-							<br/> 3. Not compatible with 32-bit Java 8.
-
+							<br/> 3. 64-bit Oracle Java 11 (Oracle JRE/JDK 11 or openjdk 11)
 
 							<footer>
 
@@ -567,14 +562,11 @@ <h3>B. Changes/Improvements in v3.07</h3>
 							<br/>&nbsp;13. More internationalization, some UI improvements and bug fixes.
 
 							<br/><br/><br/>
-							<p>For more details on mars-sim development , click on SourceFoge or GitHub logo below :
+							<p>For more details on mars-sim development, 
+								go to <a href="https://sourceforge.net/projects/mars-sim/">SourceFoge's project website</a> 
+								or <a href="https://github.com/mars-sim/mars-sim/">GitHub project page</a>.
 
 							<footer class="container" > 
-								
-								<a href="http://sourceforge.net/p/mars-sim/" rel="nofollow"><img width="300px" src="http://sourceforge.net/sflogo.php?type=16&group_id=3286" alt="mars-sim at SourceForge" style="opacity:0.4;filter:alpha(opacity=40);"/></a>
-								<br/><br/>
-								<a href="https://github.com/mars-sim/mars-sim/" rel="nofollow"><img width="300px" src="https://assets-cdn.github.com/images/modules/logos_page/GitHub-Mark.png" alt="mars-sim at GitHub" style="opacity:0.4;filter:alpha(opacity=40);"/></a>
-								<br/><br/>
 								<script src='https://www.openhub.net/p/mars-sim-git/widgets/project_factoids?format=js'></script>
 							</footer>						
 						</div>
@@ -588,7 +580,7 @@ <h3>B. Changes/Improvements in v3.07</h3>
 								<h2>Comment</h2>
 							</header>
 
-							<p> We would like to invite you to discuss mars-sim and topics relating to human settlement on Mars in our facebook group. 							
+							<p> We would like to invite you to discuss mars-sim and topics relating to human settlement on Mars in our facebook group. Please click the button below. 							
 
 							<footer class="container" >
 							<a href="https://www.facebook.com/groups/125541663548/" class="button scrolly" >Facebook</a>