I have just purchased Marketpress plugin. Previously I was

Hello,

I have just purchased Marketpress plugin. Previously I was using marketpress lite plugin. Before trying to install I deactivated the lite version and delete the plugin. However, I'm getting this error message:

"Parse error: syntax error, unexpected T_FUNCTION in /home4/demi/public_html/wp-content/plugins/marketpress/includes/common/class-mp-installer.php on line 157"

Any suggestions how to fix this?