If you have
shell access, you can easily and quickly download the application using wget.
Use the --content-disposition option to get the proper filename.
wget --content-disposition https://domainpunch.com/sed/wmdsed30_trial.zip.php
If for some reason that doesn't work, use wget without the option and then rename the downloaded wmdsed30_trial.zip.php file to wmdsed30_trial.zip