Using WS15 / GW16

I have an app I need to run and it doesn’t connect in WS16. Is it okay to use the app in WS15? It runs perfect. I know WS15 is expired and doesn’t receive any more updates. Am I risking my anonymity by doing this?

I think this is question for Whonix forum, since @adrelanos insists on asking questions about Whonix there