Multi-part RAR archives (split files) require all pieces to be present in order to extract the content successfully.
This specific build is an early post-launch update for the 1.0 Full Release of Grounded. The 1.0 era introduced:
: Additions like the Accessory slot (formerly Glider slot) for Trinkets, and Fresh Storage to prevent food spoilage.
: The full mystery of the backyard and the ability to "beat the game".
: Once extracted, look for an exe file (typically Grounded.exe ) or a setup.exe in the resulting folder to install or launch the game. Version Details (v1.0.5.3952)
: Use a program like WinRAR , 7-Zip , or PeaZip .