Upgrading from 1.0.3

[miga]

Hello

I'm trying to upgrade my 1.0.3 installation to 1.2.0.
According upgrading manual, I just have to copy old configs into the new mantis directory and invoke install.php - but it fails with errror "Table 'mantis_config_table' already exists". I tried to run update-unattended.php but got error "Upgrade from the current installed MantisBT version is no longer supported. If you are using MantisBT version older than 1.0.0, then upgrade to v1.0.0 first." (i have 1.0.3 database, i haven't used 0.x versions)

Also I tried to update to older releases (from 1.1.8 to 1.0.4) using update.php script, but always get table with many upgrades with status "Not applied"

I think I'm doing smth wrong, can you help me?

[atrol]

Is this a standard 1.0.3 or do you have some customizations / plugins installed?

[miga]

Is this a standard 1.0.3 or do you have some customizations / plugins installed?

Simple standard 1.0.3, since it was installed three or four years ago, nobody touch them (except adding tickets of course