Hi,
I am also getting the same error "Failed to load plugin c:\users\xxx\AppData\Local\Temp\cap8151.tmp\3.csx (126)"
The installation goes fine (but not prompted for additional installs).
I have (re)installed the DirectX and Visual C++ Redist from the links in the previous post, and uninstalled/re-installed Spriter, but to no avail...
I am running on Windows 7 Home Premium 64 bit with SP1 & 8mb RAM.
Any advice on what else I might try?