If the archive is "unexpectedly ended" or won't open, verify the file size or try redownloading the archive.
Right-click the .zip file and select "Extract All" or use a tool like 7-Zip/WinRAR to unzip the folder. File: Rebirthep4-ep4-up9-pc.zip ...
If the game doesn't save, try running the executable as an Administrator . If the archive is "unexpectedly ended" or won't