Hi,
We are adding a patch in next release to fix the issue.
For now, you can remove the following CSS from /download-manager/assets/css/front.css
file. You will find it at the bottom of the file.
.w3eden .link-template-default.thumbnail .wpdm-download-link.btn{
padding: 0 20px !important;
line-height: 48px !important;
font-size: 12pt;
margin: 0;
}
Best regards.