Also - you could do a "compare and contrast" between the documentation for Moodle 2.0 here http://docs.moodle.org/20/en/Main_page and the documentation for Moodle 2.5 here http://docs.moodle.org/25/en/Main_page
Installing and upgrading help
Differences between Moodle 2.0 and 2.5
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