The Counter-Strike Global Offensive Beta now has it’s own SDK which ships with more up to date tools than the Alien Swarm SDK does.
You can view the old Alien Swarm SDK guide here.
It fixes a number of issues we’ve been having with the model viewer, for example, it allows the models that have been broken up into multiple parts that don’t currently work properly in the Alien Swarm SDK like Windrunner’s and Nature’s Prophet’s to work properly resulting in the ability for me to provide you GIFs like the one below.
