Where to copy files from the .zip archive
Right-click Steam on your desktop and click the file location. Scroll up in File Explorer and find the userdata folder.
There, click on the numbers that appear as a folder.
A library with numbers will open. We need to find the 203160 folder.
Copy the files from the archive there.
Done.
Note:
If it doesn't work, try deleting the save(number).dat folder and replacing it with the file that was in the .zip archive.
Author: WeakIsen