Cannot update PFSENSE

Hello, this is my first post here. The Forum is very cool, but a have one question:
Today i have one appliance in AWS FreeBSD running at version 11.3-Stable AMD64 and i know this version is a older version of freeBSD. But when i try update running pkg update i receive a follow error:

Shared Object "libarchive.so.7" not fund, required by "pkg"

i tried to run pkg-static bootstrap -f and then the S.O return for me the follow error:

Bootstrapping pkg from pkg+https://firmware.netgate.com/pkg/pfsense_plus-v23_01_amd64_pfsense_plus_v23_01, please wait...
pkg: Error fetching https://firwamre.netgate.com/pkg/pfsense_plus-v23_01_amd64-pfsense_plus_v23_01/Latest/pkg.txz: Not Found
A Pre-built version of pkg could not be found for your system
Consider changin PACKAGESITE or installing it from ports: 'ports-mgmt/pkg'.
I don't know how I can fix this. Can anyone help me or has anyone ever had the same problem?