Once RDRFR is installed, you'll need to launch the RAGE Plugin Hook (RPH) to play it. RPH is a modding tool that allows custom plugins (like RDRFR) to be loaded into the game. To start RDR with the RAGE Plugin Hook, simply launch the RAGE Plugin Hook application. This will start RDR via the Rockstar Launcher with the RAGE Plugin Hook enabled.
The RAGE Plugin Hook offers a settings dialog where you can choose which plugins should be loaded by default. Make sure that you select RDR First Response to be loaded by default, so that it will automatically be loaded whenever you start the game with the RAGE Plugin Hook. This is the default setting.
If all goes well, you should be able to see some sheriff star icons on the game's map. These are the police stations/sheriff's offices which you can enter, and it is from there that you can go on duty as a lawman.
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