Flash will not install

System: Mac OS 10.9.5

I cannot get Flash 25 to install on

Safari 9.1.3

and

Firefox 53.0

I have Flash 21.0.0 installed now.

This happens over and over for months and months with each new upgrade from Flash. I've gone through

all the "installation problems/flash player/mac" with no success.

Here's a link to info that Adobe suggested I provide.

https://files.acrobat.com/a/preview/e9d7dd0a-f95e-435d-9fc1-b653fbdc4bf1

I would really like to solve this Flash loading problem. Any constructive help would be appreciated.

Thanks

HJMann