There is no stable releases of js-dos 7. However, latest version always available in npm repository:

If you use npm or yarn, you can obtain latest version by using npm install or yarn add. All files needed to run emulation are placed in dist folder of packages.

You should specify pathPrefix variable if scripts are included from non-root path, like this:

<link rel="stylesheet" href="">
<script src=""/>
emulators.pathPrefix = "/v7/build/releases/latest/js-dos/";