binaries/assimp-3.1.1/packaging/windows-innosetup/readme_installer.txt

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Open Asset Import Library (Assimp) SDK Installer
Release Notes
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http://assimp.sf.net


Troubleshooting
===============

1. Missing d3dx9_(some-number).dll? 
Install the latest DirectX runtime or grab the file from somewhere (that's evil but mostly fine).

2. Application configuration not correct / missing msvcr***.dll?
Reinstall Microsoft Visual C++ 2005 SP1 Redistributable (x86 or x64, depending on your system)

3. assimp.exe not in PATH
Add it to PATH. That's not a bug, the installer does not alter the PATH.

4. Crashes immediately
You CPU lacks SSE2 support. Build Assimp from scratch to suit your CPU, sorry.