Thanks for sharing your concern. There is an option to download Samsung themes for your devices from our official website or you can download it from play store. Also You can visit the link provided for further details: https://help.content.samsung.com/csweb/main/main.do
the injustice theme is not available in the theme store google for that apk download and install it then after it search for 'package disabler pro' download it too set the theme of injustice and then from package disabler disable the two theme packages and u r done wit it reboot the phone and then again enable theme and again disable them and clear cache of both of the packages
