I have read the contents of Readme.md
## System Requirements
- PHP version is not low than 5.3
- MySQL version is not low than 5.1
- .htaccess support
(of the 6.2.1)
But I know it is not right. utf8mb4 require higher MySQL than 5.1 (> = 5.5.3). I tried to install on a server with MySQL 5.1.69 and the results are not unexpected "Disturbed character set 'utf8mb4'". I think the developers should be revised accordingly.