Hi I can not install the downloaded theme on my wordpress as I do gives me this error The uploaded file exceeds the upload_max_filesize directive in php.ini.
I see two methods of solving your issue:
upload_max_filesizeproperty (as far as I know by default it is 2MB, but Sydney Pro archive is larger so you get this error), you can learn how to do it here.
Install the theme manually, by unpacking the archive with theme to public_html/wp-content/themes using FTP or cPanel File Manager.
Hope it helps
Kind Regards, Roman.