File: Risk.of.rain.2.v1.2.4.1.incl.all.dlc.zip ... -

To install, you typically extract the contents to a folder and run the Risk of Rain 2.exe file. If you plan to mod this version, you will need to install BepInEx and place plugins in the /Risk of Rain 2/BepInEx/plugins/ directory. Modding - Risk of Rain 2 Wiki

The "Incl. ALL DLC" tag typically means it includes the Survivors of the Void expansion, which added the Railgunner and Void Fiend survivors, the Simulacrum game mode, and various new items and stages. File: Risk.of.Rain.2.v1.2.4.1.Incl.ALL.DLC.zip ...

Files with this naming convention are often found on third-party distribution sites. If you are preparing to install this: To install, you typically extract the contents to