Nullsoft Installation System is a pretty small, efficient, capable installation system for Win32.

Here's what's new:

Added integer user variable support. (IntOp, IntCmp, ReadRegDWORD, EnumRegKey, EnumRegValue)
Modified WriteRegDWORD to support writing variables.
Removed netscape plug-in support (can now be done in script, using new functions)
Updated splash.exe for sound support (Thor's suggestion - note that old uses of splash.exe will have to be updated slightly for the new syntax)

Nullsoft Installation v1.50