The DLL depends on the Visual C++ 2005/2008 runtimes. Fix: Download and install both vcredist_x86.exe for Visual C++ 2005 SP1 and 2008 SP1 from Microsoft.
There are multiple forks of OBMM (e.g., the original Timeslip version, the “Extended” version, or the Nexus Mod Manager legacy version). Using an OMOD created for a newer version of OBMM with an older installer-omod.dll can trigger crashes. installer-omod.dll
64-bit vs 32-bit mismatch. Fix: OBMM is a 32-bit application. Ensure you are not trying to run it on a 64-bit-only environment without WoW64. Reinstall OBMM to a native C:\OBMM folder (not Program Files (x86) ). The DLL depends on the Visual C++ 2005/2008 runtimes