installation issue

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hi,
I'm trying to install concrete5 Version 5.6.3.4 .
when i click install concrete after filling in the configurations, it doesn't do anything. it just redirect me to default folder.
Then i need to go back to index.php/install/-/setup/ to continue the setup again.
when i check my database through phpmyadmin. it's empty.
PHP Version 5.5.31
mysql 5.5.48-cll

need some help here plz.
thanks