Me too!
On a single WP installations: Warning: Invalid argument supplied for foreach() in /home/xxx/domain.com/wp-content/plugins/download-manager/admin/tpls/addons-list.php on line 237
And on MSWP:
Notice: Trying to get property of non-object in /home/xxx/domain.com/wp/wp-content/plugins/download-manager/admin/tpls/addons-list.php on line 237
Warning: Invalid argument supplied for foreach() in /home/xxx/domain.com/wp/wp-content/plugins/download-manager/admin/tpls/addons-list.php on line 237