Catch kathmandu pro upgrading problem

Hi, I followed these steps => Download Catch Kathmandu Pro from your Catch Themes member My-Account to your Desktop => Log in to the WordPress Administration Panel => Click on “Appearance => Themes => Add New” => Click on “Uploads” and Browse the downloaded file catch-kathmandu-pro.zip from the desktop where you have it downloaded => Click on “Install Now” and then “Activate” to install the Theme but Im getting this message The uploaded file exceeds the upload_max_filesize directive in php.ini. how can i solve this problem.