It is compatible with both the Nintendo Switch version of the game and its PC release.
To install the mod on PC...
- Make a backup of the "common_en" file in your game's "smt3hd_Data\StreamingAssets\PC" folder.
- Extract the PC Version's ZIP file, and copy the "smt3hd_Data" folder to your game files directory.
- If done properly the folders will merge and the mod should be good to go.
To Install the mod on Nintendo Switch...
- Make sure you have the latest version of Atmosphere CFW installed on your system. In case you need it, here's a guide on how to do that.
- Extract the Switch Version's ZIP file, and copy the "01003B0012DC2000" folder to your game mods directory, which should be "atmosphere\contents\"
- Once this is done, the mod should be good to go.
It should be noted that this mod only affects the English translation of the game.