Problem install/upgrade to moodle 2.0.10

Problem to upgrade moodle 1.9 to 2.0.10.

Server with phpinfo() display PHP vers. 5.2.9 / MySql vers. 5.1.41.

Action :

• rename "moodle" to "moodle_old",
• create directory "moodle" and install all file of "moodle-2.0.10.tgz",
• create "config.php" based on "config-dist.php" of moodle 2.0.10 and modification with parameters of 1.9 version,
• add empty directory "moodledata".

For upgrade :

• copy file of "moodledata" v.1.9 to new "moodledata",
• don't touch to database,
• go to "http://example.com/moodle/admin".

Message = "Parse error:  syntax error, unexpected T_OBJECT_OPERATOR in index.php on line 110"

For install :

• delete file in "moodledata",
• create new empty database,
• modify "config.php" with name and password of new database,
• go to "http://example.com/moodle/install.php".

Message = "Parse error:  syntax error, unexpected T_OBJECT_OPERATOR in install.php on line 604".

I don't know to do anything, can somebody help me ?