Okay, so did you untar the downloaded package over top of the old one, or did you remove the old one completely first?
It’s weird now because your live site has plugins installed in it that would not be in the downloaded archive from PKP. Normally you’d start with a completely fresh source folder, copy in your public/ files (your files/ directory shouldn’t be in your webroot at all… right? That’s a security hole if it is.), your configuration files, and your plugins.
This is entirely a guess but I suspect that the OJS 3.2 version of FileUploadWizardHandler.inc.php still lives on your file system. And it’s being invoked in the class hierarchy, and I bet that if you didn’t delete all of the old OJS 3.2 files, the PKPFileUploadWizardHandler.inc.php class, which is the parent of the other one, is still in your installation, and it’s trying to use a method in a file that did get updated that no longer exists.
In any case, I’d start with completely fresh 3.3.0.13 code and move over your config file, public/ directory, and the plugins that you would have installed via the plugin gallery.
Best
Jason