Coowon appears to be a Chromium-based browser so it would use the PPAPI plugin. Depending on what version of Chromium it is using you may need to specify the Flash Player directory path. I tried to download the browser but couldn't locate a valid download site. You'll need to contact Coowon to find out if they auto-detect the Flash Player location or if you need to specify it when launching the browser.
Note that Coowon browser is not supported. see Tech specs | Adobe Flash Player for supported platforms.