Ensure you have downloaded every volume of the set (typically part1 through however many were uploaded).
.part3.rar – This indicates the file is not a standalone installer. You need all other parts (part1, part2, etc.) in the same folder to successfully extract the game. Installation Instructions Beyond.a.Steel.Sky.v1.5.29158-PLAZA.part3.rar
If an ISO is produced, mount it to a virtual drive. Run setup.exe to install. Ensure you have downloaded every volume of the
After installation, look for a folder named PLAZA inside the extracted files. Copy its contents and paste them into the game's main installation directory, overwriting the original files. Play: Launch the game via the main .exe file. Beyond.a.Steel.Sky.v1.5.29158-PLAZA.part3.rar