ROUTEROS download

How can I upload package with FTP?

where can I download RouterOS?..

You can download RouterOS from our download page
http://www.mikrotik.com/download.html

I have downloaded several times without numbers but after the software installed for rebooting, the following occur:
Starting…

Demo version expired

Reload RouterOS

Pls help me out to know where to start again.. please

Buy a license?

Or re-install with Netinstall as that should reset the demo license to get you another day. The wiki has detailed instructions on that.