I can not find "Web Installer"

[alfredb]

But you could find this:

Bye-bye web setup ( webinstaller )

As of today, ownCloud will discontinue the web installer, which was only needed if you did not have SSH access to the machine where you were installing your ownCloud (for example, shared hosters with FTP only access). Although shared hosters used to be helpful, as virtual servers are becoming more inexpensive and offer more possibilities for administrators, it is time to retire this means of installation. Over time, ownCloud has become more and more complex and very powerful. Today, SSH access…