Hello, WarGreymon. It's good to see you again. There may be many reasons for this, I have ideas on what might be, so let's examine them together.
Did you download the game through a program? (Internet Download Manager etc) or that was classic program of your web browser? If you use a web browser, I recommend you downloading it with a current program. This will increase the efficiency of the download process and will also prevent the missing file that you having.
Have you been formatting your computer lately?
It may be that the .Net Framework, the video card driver, and the lack of software that is related to the hardware that makes it impossible to provide an exact access to the game. Make sure you have them;
- Latest version of the .Net Framework, graphics card, Motherboard software, Direct X, and other things that you think.
In general, these operations assist the users. I hope that you will be able to access it if you do it smoothly. If for any reason they don't help you, please write it back here so that the community can help you. Have a nice day.