32-bit vs 64-bit Mismatch: Ensure your IDE/Language and the lpsolve library share the same architecture. A 64-bit Python instance cannot call a 32-bit lpsolve DLL.

Step 1: Extract the FilesCreate a dedicated folder on your C: drive, such as C:\lpsolve. Extract all files from the ZIP archive into this folder.

lpsolve55.dll: The dynamic link library required for external applications.

Click New and paste the path to your lpsolve folder (e.g., C:\lpsolve). Click OK on all windows.