We are changing how we handle one of our electronic releases: The Gamemaster Pack (GM Screen + Glory). Originally, you bought both of these components together, for $10, or $15 for the Hack Pack version. Now, they have been split apart so you can buy just one "half" of the Gamemaster's Pack.
If you have already bought the Gamemaster Pack, you don't have any reason to buy these new versions; this is a packaging change, not a content change. If we update the content in the GM Screen or Glory in the future, you will still get your free updates.
It makes a lot of sense to bundle a GM Screen with an adventure (or other GM-centric material) in print. It's really difficult to sell small adventures (as Glory is, at 24 pages) through retail. The low price point combined with the lack of durability makes these books riskier and less profitable for retailers. Bundling an adventure with a GM Screen is the accepted "sneaky but not really" method of publishing a small adventure in a format that game stores will happily sell.