Seem your router has the latest firmware. The message comes up at Online upgrade part, so why don't you just click online upgrade?

The VR2800 can work as VPN server, your computer or your phone can be the client to dial up. If you want the VR2800 to be the only VPN client, I don't think it works that way.

Max power consumption with power adapter is about 24W. If it has more functions, more powerful modules, it will consume more power.

What's the model number of your router? Better with hardware and firmware version. There are FAQs regarding how to set up parental controls if you look for it on the tplink website.

How long can be extended period of time? After some time of downloading, do you see the wireless network showing up on your computer? You cannot connect to it or it's connected but no internet...

Email notification is removed from the admin interface. It's available on the camera app. http://www.tp-link.com/faq-1563.html