Boiron

I just installed the latest update, and now my site has a php warning at the top of all pages (disappears if I deactivate Download Manager):

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘return false;’ not found or invalid function name in […]

Can I get a previous version of the plugin so that I can still use it but not have the warning visible to all users?