Comment on How to Update WordPress Themes by SEO Dave.
Means your hosting account has it’s maximum upload file size set too low, Talian isn’t even 2MB so you must have a host with a really small upload size. Amazing we are in 2012 and hosts still set this to below 2MB, there are images bigger than this now!
Either contact your host to increase the size, you might have the setting in a control panel (some hosts do, some don’t) or be able to achieve this via a php.ini file (again some hosts do, some don’t) I suggest 16MB gives plenty of room for anything else you might install.
Or use FTP to install Talian, see Talian Installation Using FTP or WordPress Theme Installer article.