You successfully installed Random Encounters Reworked.
The install-script can be reused to update the mod at a later date
Merge the scripts
You can refer to the merging instructions for known conflicts if needed
Load your latest save
Once merges are done you can go straight in game, no need to edit the settings as the mod will reset everything for you. Load a save and wait for the preset selector to appear, then pick the preset of your choice.