Chrome extension (swf) no longer runs in Chrome 57

Good morning,

    Up until Chrome 57, I could pack an extension that uses flash swf and would simply have to right click to enable it on launch. Now chromebooks and Chrome don’t give you the option to “Run Adobe Flash”. But it will run if loaded through the web. I have a game designed for 1-1 chromebook schools that now no longer open.

Any suggestions or workarounds?

Thanks

Craig