When you refer to "Simplicity" download what are you talking about ?
York used to use an OEM installed controller by that name that was just a re-branded JCI UNT1100 series device. Is that what you have or is it something newer/different ?
Maybe a picture of it ?
If it's the JCI device the "zip" file may contain 1 to 4 files with *.cfg, *.asc, *.ddl and *.prn extensions none of which are executable. If that is what you have you will need the JCI Mtools software and an interface device. Or I could be completely wrong !
If sense were so common everyone would have it !
Any advice provided is worth exactly what you paid for it, not a penny more not, a penny less !!