Upgrade on Debian from 1.0.3 to 1.1.0-rc2.3 - not supported distro?

Hi,
I've tried to upgrade from stable to current RC, on server is Debian 7 x86_64.
When I did: imscp-autoinstall I saw attachment.
And that's all, end of upgrade.

Thanks, that upgrade destroy all configuration files and now nothing is working, nothing from 30 domains. Sites, mails...

Not, I've made github upgrade, bug dovecot -s were active, also with unused function in master.cf
I've restore 1.0.3 ant that works correctly.

Upgrade scripts can save directory of maildirs and www? That will be usefull, f.e. I have mail in /home/mail and www in /home/www, so after upgrade I have to correct that paths.