If you have problem with missing dll file - download it and fix the problem. It's easiest way to solve problem like "The program can't start because [some dll file] is missing from your computer. Try reinstalling the program to fix this problem.". We have 16.854 files of 11 Gb, just look at the categories or simply search.
Note: If possible try to reinstall software/driver that is missing, such as DirectX, Visual C++, Qt or MS Word, rather than just download one single dll file.