bertpat56 said

it won't let me proceed download with just one device but my work software only works on firefox

Unless you are trying to create a Firefox (sync) account, you don't need a second device.

Where are you downloading from  ?

Would you please make sure that you download from here :

https://www.mozilla.org/firefox/all/

Here you can choose your preferred language.

After first installation and after updates, Firefox may display a welcome page encouraging you to install other Mozilla products. Those are optional and you can browse to pages of your choice using the address bar/search box, bookmarks, etc.