1. The server php or mysql version is outdated or php mysql is not installed.
2. Sometimes when the files are uploaded via ftp some of them gets corrupt due to character encoding. (This issue is particulary common if you use filezilla)
1. Please make sure your server the has the necessary configuration for running the script.
2. Upload the zip file from cpanel and extract it from there. Or you can chekout this links to stop filezilla form corrupting your file: http://stackoverflow.com/questions/554960/how-can-i-stop-filezilla-changing-my-linebreaks
If the issue still persists create a support ticket giving an ftp access information; our team will inspect the issue for you.