Installation.md

-The TDL tools are available as a set of Eclipse plug-ins. You need to first be able to run Eclipse. The [Eclipse Modeling Tools](https://www.eclipse.org/downloads/packages/release/2020-06/r/eclipse-modeling-tools) distribution contains most of the necessary prerequisites for the TDL tools.
+The TDL tools are available as a set of Eclipse plug-ins. You need to first be able to run Eclipse. The [Eclipse Modeling Tools](https://www.eclipse.org/downloads/packages/release/2021-06/r/eclipse-modeling-tools) distribution contains most of the necessary prerequisites for the TDL tools.
 
-Once Eclipse is up and running, you need to add the [update site](https://tdl.etsi.org/eclipse/latest/) for the TDL tools: 
+Once Eclipse is up and running, the easiest way to install the TOP tools is from the Eclipse Marketplace - simply search for TDL in the Eclipse Marketplace client within Eclipse, or go to the [TOP Marketplace Listing](https://marketplace.eclipse.org/content/top-tdl-open-source-project) and drag the install button into the Eclipse window.
+
+Alternatively, you can install the plug-ins manually from an update site. In this case, you need to add the [update site](https://tdl.etsi.org/eclipse/latest/) for the TDL tools:
 
     https://tdl.etsi.org/eclipse/latest/