product like WA901ND can be set as client mode, transfer wireless connection to wired, and it has IGMP proxy to be turned on or off.

So connection drops and you have to reconnect? Verify whether the network is fine on other devices, otherwise, check your router. Do not set the adapter to be turned off when computer goes to sleep...

If nothing wrong with the adapter, just keep the default settings. most of them are set to automatically adjust themselves.

The utility is optional. Even though it doesn't detect the adapter, should not affect the performance. Check the signal strength, make sure it's not too far from your router; verify connection from...

Yes. they are compatible. same way to pair

Try register from cloud website or the camera app. Any error if it failed? http://www.tp-link.com/en/faq-818.html