it means cannot be used due to updates or no connection
You could sync Google accounts to Chrome. This can be done by the people's tab in the Settings.
sign in to Chrome, and sync your data, Enter a Sync Passphrase if needbe I may be misunderstanding your question, so look around a bit more, maybe check the google forums
There are a number of download managers in the market. Anyone can sync with Chrome to it's fullest.
You must sign out of your Google Account, or if you mean Chrome, then you must sign out of your Chrome Account. You can do that by typing in chrome://options.
There is no way to sync chrome extensions. It could be using a third party extension only.
It means there is a risk of bug or virus. Google Chrome automatically tells about the threats.
No, you can download Google Chrome from Google.
The question seems like incomplete. If you want to know how to make Chrome as a default browser then type chrome://settings in address bar and hit enter. On the Settings page you can make Chrome as default browser.If by 'activate' you mean that how to make Google Chrome working then try reinstalling Google Chrome. It is recommended to uninstall the current version then install the latest version from Google Chrome Website.Website for Google Chrome is mentioned in Sources and related links(below).
Google Chrome can be downloaded via the official website of Chrome. You can type Google Chrome on Google and get the first website.
Google Chrome does not have it's own email system. However Google Mail and Chrome both are products of Google.
Google Chrome
Google Chrome is a web browser, while Google is a search engine. You can continue using Google while using Google Chrome.