Mastering Unity 2D Game Development - Jackson 2014

To make money from your video games:

Use 32 bit windows (XP,Windows7(x86)) AND 32 bit Unity (Unity 4.5.4f1(x86)) AND 32 bit installer maker (InstallShield 2010). That gives you the largest customer pool.

Also, Unity is a cross-compiler and as such produces ineficient games so avoid the fancy stuff that eat up computer power for nothing. Your players will ALWAYS choose speed over fancy beauty