That's not the save file you copied the entire folder.
Inside that folder should be the save file.
Viewing post in Leisure yacht (NSFW 18+) comments
I found, under User Data\ Default, SaveGame_xx.vndata and SaveGame_xx_Header.vndata files with numerous other files. I restored the original game folder and then copied only the SaveGame files. Once again, I got the error, black screen when clicking ok, and then I had to close the program. Do I need to copy more than these two sets of files?