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A Question on Ultimate phpBB3 SEO

I want to install Ultimate phpBB3 SEO to optimize phpBB3 my forum

The steps are:
1) Backup all your files;
2) Apply the mod code changes on copies of your files;
3) Upload all files;
4) CHMOD the phpbb_seo/cache/ folder to 0777;
5) Empty the phpBB/cache/ folder ...