Solved it .
If a minimum IOS version is needed for an app, in that case Apple does not propose an app version downgrade that works with your IOS . Unless you have already downloaded it before . There are 2 ways of solving this . Either you download the app with an apple device which has the newer version of IOS and is under your apple ID . Or you download the app under itunes, under your apple ID, without connecting the 'old ' device . Once you have done either of these you can download the app with the older device over the appstore . It will then ask you to download a compatible app version. Click yes and there you have the Firehawk remote .
@suedehead99 : No idea how you managed to install it unless you had it installed before line 6 released the new version .
Thanks to google and howtogeek
www.howtogeek.com/263568/how-to-install-older-versions-of-ios-apps-on-an-old-iphone-or-ipad/