After activating the Impreza theme you can enable automatic updates for it, just like it works for themes that are listed in the default WordPress repository. Go to Appearance > Theme Options > Theme Update page and enter your ThemeForest user name and ThemeForest API key.
You can download a new version of Impreza at your downloads page. After downloading there are 2 ways of upgrading the theme:
- Recommended: upload contents of Impreza folder from downloaded archive to wp-content/themes/Impreza folder on your server overwriting all files (via FTP or other file transfer method)
- If you have no access to the server, or you dont know where the theme folder is, you can go to Appearance > Themes at WP admin, then activate any other Theme (like Twenty Twelve from standard package) and delete current Impreza theme. Don’t worry, all posts, pages and other items will be saved at Database. Then go to Install Themes tab and Upload new .zip file with updated Impreza theme, then activate it. After that please go to Appearance > Theme options and verify that everything is up to date there and check if Menu is selected right (it must be OK, just make sure)