You will need WinRAR or 7-Zip to open the .rar file.
Some games require you to enable the mod in an in-game menu or a separate launcher before it will take effect. Retransition v2.01.rar
To give you a more tailored guide, could you tell me this mod is for or where you downloaded it ? I can then look for specific "load order" instructions or known bugs for that version. How to EASILY install Resident Evil 2 Mods You will need WinRAR or 7-Zip to open the
Ensure your game version matches the mod. Updates can often break older mods like v2.01. Retransition v2.01.rar