this is a game (ok?)

Instructions to download are in the screenshots: 

 in screenshot no.2 is the downloaded zip folder,

 now right click on it

 now a popup menu will appear,

 it should look like screenshot no.3

 in the popup menu click on extract all

 now the popup menu in screenshot no.4 will appear

 now click on browse to select an area where you want to extract the folder

 now click on extract in the bottom

 now go to the extracted folder and double click it

 and then in the middle, double click on "TheBossFightNull"