Space Shuttle Engine (SSE) pack by Klockheed Martian Engine Manufacturer - for Kerbal Space Program.
You should be all good! (check for latest version on CurseForge)
To install, place the KlockheedMartian folder inside
your Kerbal Space Program's GameData folder:
<KSP_ROOT>/GameData/KlockheedMartian/SpaceShuttleEnginesKlockheedMartian folder into your
KSP's GameData folder as follows:
<PACKAGE>/KlockheedMartian -->
<KSP_ROOT>/GameData/
<KSP_ROOT>/GameData/KlockheedMartian/SpaceShuttleEnginesTo install, place the GameData folder inside your Kerbal
Space Program folder:
<KSP_ROOT>/GameData/KlockheedMartian/SpaceShuttleEnginesGameData folder into your KSP's
root folder as follows:
<PACKAGE>/GameData -->
<KSP_ROOT>
<KSP_ROOT>/GameData/KlockheedMartian/SpaceShuttleEngines<KSP_ROOT>
  + [GameData]
    + [KlockheedMartian]
      + [KlockheedMartianLtd]
        + [Agencies]
          ...
        + [Flags]
          ...
        + [Localization]
          ...
        ...
      + [SpaceShuttleEngines]
        + [Assets]
          ...
        + [Compatibility]
          ...
        + [Config]
          ...
        + [FX]
          ...
        + [Localization]
          ...
        + [Parts]
          ...
        * #.#.#.#.htm
        * Attributions.htm
        * changelog.md
        * CC-BY-ND-4.0.txt
        * ManualInstallation.htm
        * readme.htm
        * SpaceShuttleEngines.version
    ...
    * ModuleManager.ConfigCache
  * KSP.log
  ...