it's a bit tricky to do it on windows 10. need to do some settings on another computer first. Here's an example for iPad http://www.tp-link.com/en/faq-1056.html Or do this on windows 10...

i dont think so

I would say update the firmware of the RE650. and connect to the 2.4GHz network, 5G is not as good as 2.4G to pass through walls or concrete obstacles.

umm...that's a problem, I also find WDS bridge on the website, but there isn't one on the web UI of the router. you can use range extender mode, can set up separate network name

TP-LINK AV200,AV500,AV600 powerline adapters adopte HomePlug AV Standard, so they are compatible with each other,AV1200 adopt HomePlug AV2,that is also backward compatible with HomePlug AV...

http://uk.tp-link.com/products/list-18.html?filterby=4859&page=1 there no single passthrough type powerline sold, especially for newer models. maybe some old model such as TL-PA4010P may be sold as...