I have a radar under t mobile contract but I updated it using the manual way of downloading the cab files. I installed both the OS update and the firmware update. Found these cab files on the xda forums. I can always make a video or something on how to update.
Oh wow sorry I lied, you can only view and make a account on the instagram website. BUT! You can download this Android emulator on your PC and upload your pictures that way. Here is a link to that.
Workaround lets you upload Instagram photos from your desktop computer | How To - CNET
I highly doubt it, HTC hasn't even bothered to update their HTC apps for 7.8. You know the HTC hub, well it looks so messed up as a small tile. I don't think we will get any support from them, but who knows :/
Just want to confirm everyone that I got 7.8 on the radar and you will be getting it very soon! Just be patience on Zune or install the update manually With the cab files. It's running very smoothly and it's a nice touch for people who bought the phone 1 year later
The 7.8 update was confirmed to have a screen capture feature on legacy devices. I suppose you can wait it out or get a developer unlock phone. You can also maybe run the windows phone 7 emulator with visual studio 2010