This is probably a question for Mike, but someone else might know the answer.
One of the other boards I run has modified the default theme (I know, stupid). Anyways, I was afraid of jacking it all up so I wanted to copy everything to a second installation and do the upgrade there to ensure I knew the steps before running it on the actual forum. So I copied everything, including the DB. I updated the settings file and the paths to the theme.
When I went to run 'upgrade.php', it kept telling me that it found missing or outdated files, specifically the english language from the default theme. I uploaded them again but it still keeps saying that. I imagine that there must be something I'm missing because I copied everything to a new location, but I have no idea what it is. I even confirmed that the language files were updated to the right version.
A second question: what is the easiest way to take the existing 'default' theme that is modified and have it not be the default so that upgrades do not affect it?