Are you on windows? There you just habe to right click on the zip, and then on extract:
And then you should have a new folder called Footbrawl_playground at the same location where the zip is.
In the Footbrawl Playground folder you should have now a Footbrawl Playground 32bit.exe and a 64bit.exe -depending on your system you just have to double click one of these and the game starts.
Let me know if that helps :)