If you are unable to follow the FTP method/one click update, follow the alternate method below.
1. Download the latest version of the theme from the downloads section of your themeforest account and then,!
2. Backup your Options Panel by going to
OSHIN OPTIONS -> IMPORT / EXPORT -> EXPORT -> Download before proceeding with the update.
3. Install this plugin
4. Proceed to install the new update,
APPEARANCES -> THEMES -> ADD NEW -> Oshine.zip and in box that says Upgrade Existing theme, choose YES.