You need to use an anchor tag to make something downloadable.
Like
<a href="/images/myw3schoolsimage.jpg" download>Click to Download</a>
But in case you want a button with a downloadable link, here is it
<button><a href="/images/myw3schoolsimage.jpg" download>Chick Here</a></button>
Just put the anchor tag with an attribute "download" inside a button.
To read more about anchor tags w3schools
In your case, as I saw from your site, use the code snippet below
<a type="button" class="btn btn-primary" download="https://cdn.glitch.com/63be2122-7b8d-4d1e-85a5-7d557ae54cc5%2FUPS.svg?1555285173725" href="" target="_blank">Download SVG</a>
Here, instead of putting the URL in href we are giving it to the download attribute.