Look for the /mods/ or /scripts/ directory within the application's root folder.
If "Katsu-First_Sig" is a separate profile, look for an "Import" or "Load Preset" button within the Ruslan_Device interface. Troubleshooting Common Issues Download File Ruslan_Device_and_Katsu-First_Sig...
Some devices require specific versions of "Max" or a particular OS. Check the creator's "ReadMe" file for compatibility notes. Look for the /mods/ or /scripts/ directory within