Thread:Project:Support desk/Browser upgrade from 1.21.1 text missing

Hi

I'm running mediawiki version 1.21.1 and I have to upgrade because my web host no longer support PHP 5.3 and my website is broken. When I go to /wiki/mw-config/. the first page lets me select the language but the second page has a light bulb in an orange box with a text box underneath and the progress list on the right but nothing else. I have tried highlighting text to see if it is invisible for some reason but it just isn't there, here's a screenshot. How can I fix this so that I can continue the upgrade? Because of PHP being updated the website does no display text on pages, I assume this is the same problem.

The website is ccfzatlas.com.

I have managed to get as far as the Upgrade existing installation screen, the orange box has a tick in it and it seems as though it was successful however there is no option to continue to the next page.

Thanks