That’s awesome Tobias!
I see the code if (!res.match(/success/)) {
is in two files named wpdm-be-memeber.php
Located here:
/download-manager/tpls/wpdm-be-memeber.php
And here:
/download-manager/tpls4/wpdm-be-memeber.php
I changed code and it still did not fix on my site. Glad it works for yours!
Shahriar, I will send you login credentials in private message next.