Extremely sorry for your inconvenience. In last update we have improved code base and using namespace, which require php v5.3.0+ ( http://php.net/manual/en/language.namespaces.rationale.php ), may you please update your server php version, however if that is not possible, you can get back the previous version from here https://downloads.wordpress.org/plugin/download-manager.2.8.3.zip
I am experiencing the same problem as lalitahir on my sites. I have tried 4 different sites, each failed with the exception of one that actually had no downloads. I have other sites to upgrade but now am afraid to proceed with this update.
My php is version v5.4.24. I had to stop updating Download Manager and revert back to the previous version to get these sites backup and running again.
Parse error: syntax error, unexpected T_STRING in /home3/storesby/public_html/ainsworthetc/wp-content/plugins/download-manager/download-manager.php on line 12
@cainsworth, php version 5.4 will never show the error, please check with your hosting support