Somewhere in your program files , you probably have everything you need.
Most of the photo software is capable of doing transfers, and I am guessing most printers come with software that is capable.Look for commands like "flip horizontal", or possibly even a setup command in the printer driver that is specifically for iron-ons.
My two year old HP 722c came with a separate disk for such projects, and Adobe photodeluxe has it in the photo software.🙂😉