But I already download it but still unable to play
I'll help you through the steps.
1. Download the latest version (it should come in two parts, Part 1 and Part 2)
2. Extract both of them individually to the same folder.
3. open the folder of Part 1.
4. There's a program in there which you'll need to run.
5. The first window that pops up, click Ok (it should already be highlighted)
6. The second window that pops up, is looking for Part 2. navigate to it and select the program in there.
7. It'll finish shortly after with a complete version.
8. Voila! You now have a fully working version of FOBS, Zell's latest build.
These are the steps I took, so give them a follow and it should work fine.