How to undo ports tree update in FreeBSD?

Question

FreeBSD

Hello.
Installed FreeBSD 10.1, updated the ports tree with the commands:
portsnap fetch
portsnap update
Now when installing ports it says:
"Ports Collection support for your FreeBSD version has ended, and no ports are
guaranteed to build on this system. Please upgrade to a supported release. "
Okay, I don't want to upgrade FreeBSD, how can I go back to the old ports tree that was before the upgrade? If this is of course at all possible) I would be glad for any advice.

Answer 1

ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/i3...
but I do n't know what condition the ports are