SeaMonkey 2.46 Install on non-SSE2

SeaMonkey on a non-SSE2 computer:

AMD Sempron 3000+ "Barton"
Features: MMX, 3DNOW, SSE

*MISSING: SSE2

Existing: SeaMonkey 2.40

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Says 2.46 is available
Downloads
Restart to install
Installs

Result:  "This application failed to initialize properly (0xc000001d)"