The map in the download version will not work until you generate your own api key from your google account. Go to https://developers.google.com/maps/documentation/javascript/get-api-key. Click on get a key button and genrate your key.
Now, Go to the HTML file your page and scoll down and locate the following code:
<script async defer src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&" type="text/javascript">
In the above mentioned code replace YOUR_API_KEY with the key your genrated key. The Google map will now work perfectly on your website.

