After switching to Windows 8, I have had the fun of reinstalling all my apps. The first annoyance was discovering that the 7.1 (and 7.1.1) versions of the Windows Phone SDK does not work with Visual Studio 2012 (damn), so back to install VS 2008 aswell.
But I then hit another problem – the SDK kept failing to install. A google around lead me to this post. Downloading the app, leads you to another 30 odd Mb of downloads. Fun.
However, installing this update and then running a repair on the Windows Phone SDK 7.1 did eventually get it to install.
Then you need to install the 7.1.1 update, and you should be away.
Don’t forget to ensure you apply the VS 2008 SP 1…
N.B: If, like me, you need to do all this on more than one PC, you might find the download in the middle annoying. Once you have downloaded it, you can grab the files from (on Windows 8 anyway, adapt for your platform): c:\Users\<username>\AppData\Local\Microsoft\GFWLive\Downloads.