I used OSK 188oms for years and found it was really good to use, but recently OSK and RHB merge, so 188oms does not longer work for real time trading charts or maybe I can subscript at another place of your other apps?
Before switching to a completely new application, I recommend to use the We're here to help page on their official website. Contact the developers and explain the situation and they should provide a workaround to keep using the application you love. If by no means you won't make a deal with their application, then you can look for an alternative.
Support page: http://www.rhbtradesmart.com/professional-support.html