I have just installed the upgrade of NWiki... the install went smoothly, and everything appeared to migrate properly.
The first issue came from an error with the mod/wiki/filter.php file, this was resolved (after much investigation) by deleting the file.
The second issue is from the following error
Undefined property: stdClass::$allusersaresitestudents in C:\Inetpub\wwwroot\moodle\lib\deprecatedlib.php on line 581
I cannot work around this one, and I was wondering if anyone had any ideas.