To open these files, you generally need to have all parts (part1, part2, part3, etc.) in the same folder. Right-click on part1.rar and select "Extract Here" using software like 7-Zip or WinRAR . These programs will automatically pull data from part4 and all other volumes to recreate the full game installer.
Hotel Renovator is a simulation game where you restore and manage a run-down hotel. Hotel_Renovator-FLT.part4.rar
If you are getting a "Checksum error" specifically on part4, it means that part was corrupted during the download. You don't need to redownload the whole game—just delete and redownload that specific part4 file. To open these files, you generally need to