Model is TL-WPA281? What's the firmware version of it? You may need to upgrade the beta firmware to support Airplay and Airprint. Subnet a ticket to ask for it....

You printer is not in compatibility list of W8980, right? When the printer is connected directly to your PC, can you print? http://www.tp-link.com/common/compatible/print-server/

During installation, you installed the driver only, or you installed both driver and utility? In All Programs, can you find the utility and open it?

Check if the adapter has been identified or not. Right click on Computer and go to Manage. Go to Device Manager. Check Network Adapters or Other Devices. Try to unplug the adapter and plug it back to...

V9.2=V9.0 No worries. You can upgrade the latest firmware TL-WR841N_V9_150310 directly.

Sounds like faulty. If the firmware you downloaded is the right one and you upgraded the firmware by cable connection without power cut-off, you should be able to replace it under warranty. Contact...