Yes possible,
please put the below code after this line,
jQuery('#reCaptchaLock_<?php echo $package['ID']; ?>').html('<a href="'+res.downloadurl+'" class="wpdm-download-button btn btn-secondary btn-lg"><?php _e( "Download" , "download-manager" ); ?></a>');
like
jQuery('#reCaptchaLock_<?php echo $package['ID']; ?>').html('<a href="'+res.downloadurl+'" class="wpdm-download-button btn btn-secondary btn-lg"><?php _e( "Download" , "download-manager" ); ?></a>');
setTimeout(function () {
jQuery('#wpdm-locks').modal('hide');
}, 5000);
from this path plugins\download-manager\tpls\lock-options\recaptcha-lock.php
file.
The modal will close after 5 sec. downloading the file.
And for making back-up the tpls file, you can follow this doc, https://www.wpdownloadmanager.com/doc/template-files/
Thanks.