Checking if files are writable
Some files need to be writable for ElkArte to work properly. This step allows you to let the installer make them writable for you. However, in some cases it won't work - in that case, please make the following files 777 (writable, 755 on some hosts):
attachments
avatars
cache
packages
packages/installed.list
smileys
themes
agreement.txt
db_last_error.txt
Settings.php
Settings_bak.php