I was going to say try the Media Creation Tool, however I downloaded it, and Pro does not show up in the list of choose-able versions.
You probably downloaded Home Singlelanguage which only contains Home, you need to download the normal " Windows 10" iso to get the Multiple Editions Home and Pro.
Your own key or KMS? If you someone had done an upgrade to pro but the system has a home key in the bios, you could install pro and it would still activate on its own after install as well.
if you have already a home license 7/8.x OEM or whatever purchased with your pc [ data written in your uefi bios ] the multi iso will chose for you the version without asking you. if you have home and want pro you will must force it with a proper ei.cfg file. there are a lot of info about that in this forum and www. c