Also, when requesting for help please provide meaningful information. A 404 only indicates that the "document is not found" but it doesn't say anything about your webserver setup.
In this case, the system is redirecting to a virtual route (/install) so you must check that the rewrite module (or rules) of your webserver are working properly.
Unfortunately, this ticket has more than seven days without a reply or feedback from the original poster. We will now consider this ticket abandoned and its now closed.
Don't hesitate to create a new ticket if this matter is still causing you issues.