wpblacklist permission problem

Tried to install the wpblacklist plugin this afternoon but have run into several problems, probably due to the security setup on the server. It initially wouldn’t install as WPblacklist-install.php didn’t have permissions set to 644. After the installation ran through, I had to change the permissions in wp-admin to wpblacklist, wpblmoderate and wpblsearch.php files to 644 then it all seemed to work.