You don't need unity if you do what I tell you.
Yeah dude, have you tried entering parenthesis? It'll let you input decimals and stuff like that.
That happened to me too and that's how I resolved it.
Just look for the BALDI.X_X_X file (there will be numbers where the x's are) right click it, extract all, then it'll give you the option to choose where you put the file. I put it in the download section. Click extract, then once it's extracted click on the extracted file and it'll open. You'll see 3 different files. Click the one that says "BALDI" and has an icon beside the text. You can move the icon to your desktop at this point. boom. game.