Slackpkg not work

Hi! Some unknown reason slckpkg not work.
I try to reinstall a fresh Slack and reuse slackpkg, but nothing to do.
I follow next stpes

1 do a fresh installation
2 uncomment

Quote:

ftp://ba.mirror.garr.it/mirrors/Slac...ckware64-14.2/

on /etc/slackpkg/mirror

3 launch my script to upgrade all

Quote:

#!/bin/bash slackpkg update gpg slackpkg update slackpkg upgrade-all slackpkg clean-system

So I try to resolve changing a FTP but nothing to do. My necessity is to upgrade Firefox, because: 1 - with 45.2 Classroom not work, 2 -Firefox not upgrade itself.