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1.Before starting manual installation give writable permissions to log directory.
2.Select 'Database System' as Mysqli If it does not work then try with Mysql.
3.Make following changes in .htaccess i.e RewriteBase [[relativeurl]] .
4.Remove DEFINER=`root`@`localhost` from `[[dbprefix]]view_posts` table in database.
5.Check for new languages during update, from '/source/languages/' folder and update them in install.xml.