Need to Updating from 2.2.1 to 2.5

I kinda new to vanilla forums. I already have a forum but its little bit older Version 2.2.1. Now I want to update it for 2.5. I downloaded and read the readme file. I did replace files as they said. But Still no luck. Can anyone help me with it, please? Any steps by step or links would be great

Thank You


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