I'm stumped. I cannot get the auto installer to run.

I'm using the Github version and upgrading from SO 4.0.2 Clicking in the admin does not start that installer and both ADMIN/auto_loaders/config.so.php and ADMIN/init_includes/init_so_config.php remain.

I read that some servers don't honor the autoload, so tested this same version of SO on a vanilla 1.5.4 cart. The installler ran.

One difference is this upgrade site is in a sub-domain but I don't see how that would matter.

What should I be looking for as the cause?