Missing Page Type

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Hi all,

I have a client who recently tried to update to the newest version of Concrete5 without doing a backup.

He was using the Blogga add-on, and unfortunately, it's not compatible with the newest version of Concrete5.

I removed the line
define('DIRNAME_APP_UPDATED', 'concrete5.xxx');

from his /config/site.php, and now the site has reverted and working like it should be.

However, now the site does not recognize the "Blogga" page type, does not render anything for that page type, and now I don't have access to the Systems and Settings from the dashboard either.

I do have a backup for his site, but it's months old, and it's an event promotion site, so he'll lose months of events if I revert, so I'm holding that card as a last ditch effort.

Does anybody have any suggestions?

EDIT: the location that's unreachable from the dashboard is /dashboard/system/jobs/ it says page cannot be found