I'm not sure if I'm understanding your question but I will try to answer it.
Typically you only need a 32 bit executable if you're running a 32 bit Operating System, such as Windows XP (Or older) or 32bit Vista/7/8/10 - You can find out which type of OS you are using by typing "System" in the search bar - it should pop up with "System" or "System Information" - one of the two - and it will list if you are running a 32 bit or 64 bit OS.
Typically, if you have a 64 bit OS, you almost always want the 64 bit version, because it utilizes the operating system better, allows more RAM usage, etc.
Hope this helps, and sorry it took so long for someone to respond.
EDIT: When you type "system" into the search bar, make sure it's the search bar for your Windows, and NOT Internet Explorer/Chrome/FireFox.
Post edited September 05, 2017 by Leucius