Documentation for all WebAssist products is accessible from the Support pages found here:
We add the Getting Started Guides to the Download Center so that people can get moving with the products right away. However, we stopped putting all tutorials and training resources relating to a product there because it caused the Download Center to get very cluttered and hard for anyone to find anything. Thanks for reminding us that it did not get added to the HTML Editor Download Center - we will get that up as soon as possible.
Either way, we recommend that you go straight to the support page for the product you are using to find all the various resources that are available. You'll only find the Getting Started Guide in the Download Center.