App developers vs product quality of older generation android phones

Since the app started I have been using it. It is a wonderful idea and I do love using it. BUT For the past 3 months the app closes down even before I can start my order with a message 'unfortunately the app had to close down'.

I reported it previously and received an answer I do not really understand. My cellphone is a LG G-3 model. I believe the app should be accommodating this generation mobile phone? It is an android phone, per se? I eventually bought a new phone (R 5000 later) so that I can make use of the Checkers app. But if the FREE app is going to cost me R 5000 and more every 3 to 5 years, then I am wondering if the luxury from buying from home is justified by the app price. And yes, I DO have the most recent 6060 app as available on the play store. (On BOTH my phones) Only the newer phone (LG Q60) allows me to do transactions. As mentioned above, the app does not allow my LG G3 phone even to go to the launching screen of the 6060 app. It turns the wheel and then says ' unfortunately....'

Please. I do not know why the app is not functioning correctly on my older android phone. But I believe that app should keep functioning correctly even though new updates come out. Otherwise the programmers / developers of the apps are doing something not right.

I believe that there might be other people who might be having trouble with this android generation discriminating app. Please try to accommodate older android versions too?