ACEX 1K & Quartus II

I'm try to use Quartus II 10.0 Web Edition with an existing EP1K50TC144 (ACEX 1K) project, but when launching the project I'm told "support for device EK1K50TC144-2 not installed".

I've searched and searched but I can't find any mention of a download or update that will install support for this device.

Do I need to use an older version of Quartus? If so, which one supports this device?

Thanks!