How can i download dynamic HTML in automated procedure?

Ok, im desperated.. I don't know anything about web technologies, web programing, frameworks and all of this and i need to download FULL HTML FILE - with all dynamicaly rendered content (javascript? ajax?..) and i even don't know how to name this..

Please save my life (absolutely frustrated), and show me a few lines of code (any language, command line in windows or simple external software) that will be able to get this done.

In need to do this for few hundred websites, so repeatable and automated procedure is needed.

Thanks