http://everydaytechy.blogspot.com/

I hope you downloaded the most recent version of Koha instead of using the download link in that post. The latest version can always be found here: http://koha-community.org/download-koha/

when I open it on browser 404 error is on my  web page."site not found in apache2 location "

This is an Apache configuration problem rather than a Koha problem in particular. Check the instructions under the heading "Add Koha site to Apache and configure Apache2" and try searching for resources that cover Apache virtualhost configuration. -- Owen -- Web Developer Athens County Public Libraries http://www.myacpl.org