As you can see on our demo WC Product Vendors plugin is shown for demo purposes only. This plugin is not included in our theme. http://prntscr.com/cir752
The same situation with languages and currency switchers.
If you want to create multilingual and multicurrency site you may use premium WPML plugin or free – Polylang/qTranslate plugins.
If something goes wrong and after base demo content import you did not get demo menu you may create it manually following our documentation http://8theme.com/demo/docs/classico/#menu Or provide admin panel access and I’ll create it for you in no time. To import additional pages go to Theme Options > Import/Export > Dummy Content > scroll down to section Additional Pages import > choose the page and press import.
To add login/logout buttons go to Appearance > Widgets and add Text widget with the following code in Right Top bar widget area <a href="#">SIGN IN / SIGN UP</a> Instead of # add link to My Account page. To enable registration on My Account page go to WooCommerce > Settings >Account > check “Enable registration on My Account page”.