Read the explaination about upgrade here. http://forum.tp-link.com/showthread.php?80292-TL-PA4010-drops-multicast-packets&p=158193&viewfull=1#post158193

Any other extension cord for you to test? As I said, extension cord which has surge protector function plugging-in such equipments to the outlet can help to avoid interference.

1. Any anti-virus software is running on your computer? Try to disable it. If possible, try to install the utility on a different computer. 2. Homeplug AV standard... To manage other devices, is...

It is a bug verified by TP-LINK support indeed. Actually, the password cannot be longer than 15 characters. If it is longer than 15 characters, only the first 15 will be saved as the password. When...

It is not reserved for "enterprise class" APs. As I know, the latest firmware of RE200 adds DFS feature. http://www.tp-link.com/en/download/RE200_V1.html#Firmware

You got a modem router which is connected to WAN port of WR841N, right? You have to open port 80(is it the port of your webserver?) for WR841N's WAN IP 192.168.0.11. Hope it helps.