There is no support for Galaxy Ace regarding Adobe Flash Player and now it has been reported that this features will be discontinued regarding its support for mobile phones and it will be replaced with HTML5 technology. There are other ways of installing custom ported Adobe Flash Player installations but it is not recommended and an alternative to this situation does not exist. Plus, the custom install of the Flash Players involves that your phone is rooted. You could try and install Dolphin HD browser which comes with native Flash support and it will solve your problem but an alternative solution for Adobe Flash Player is out of the question.