Before install pligg you want to change some file and folder permission
here with i am attach modechange.php file
currently i am set the mode for below files and folders 0777(If you like to change 0777 to 0755 open the modechange.php and $mode = '0777'; change the value here)
* /admin/backup/
* /avatars/groups_uploaded/
* /avatars/user_uploaded/
* /cache/
* /cache/admin_c/
* /cache/templates_c/
* /languages/ (And all of the files contained in this folder should be CHMOD 777)
just upload file this on root folder and run in your browser it will change mode
after pligg install open the file modechange.php in your browser and then click the link below
Click here to Delete Install folder and change dbconnect.php mode 0666
it will delete your install folder and change mode of the dbconnect.php
after delete your install folder.. Please delete this modechange.php from your root folder