Please install the 2014 or 2015 version. (2015 is slightly better.)

$ cabal update

$ cabal install -j MagicHaskeller

(Ignore $ which just denotes the prompt.)

On Windows + Haskell Platform 2014, you may need to use

$ cabal install -j MagicHaskeller --flags="-NETWORKURI"

instead. The point is to force to use the already-installed version of the network package.