FileUpload on 2.1b1
If you installed fileupload from this addon repo and tried using it with 2.1b and you experience problems , make sure you have all the files necessary which are not available here, they are at Github
The fileupload from here is missing a file called fileupload_functions.php . If you want to use file upload for 2.1 you need to get it from the Github Repo.
Also I recommend removing the version requirements or changing them to match your version.