Upgrading not going right

[Ryanx0r]

Hey,

Call me dumb, but I RTFM.. and am doing everything it says.. I changed the prefix in the upgrade...php script and so forth. But when I try to upgrade, it says:

Coppermine Photo Gallery seems not to be installed correctly, or you are running coppermine for the first time. You'll be redirected to the installer. If your browser doesn't support redirect, click here.

And then takes me to install.php (where I need to fill in mysql password, admin password and so on and so forth) (much like a new install.. but not upgrading.. :/).. any help or nudges in the right direction would be appreciated..

ps: I'm upgrading from gallery 1.3.5

[edit]
Oh dear God, I'm just plain stupid.. :/ please disregard this topic and delete if possible.. I was reading the Upgrade from 1.0.X to 1.4.X guide.. and not the upgrade from 1.3.X to 1.4.X ... d'oh
[/edit]