:Update can't execute right

- ENVIRONMENT
- windows 10
- vim 8.0

when I execute update command then I meet this error that 'D:\Program' is not a executable command. I know this issue why happened in here, because `set DEST=D:\Program Files (x86)` is not right way that set variable on windows 10 in file with name update-*. But I can't solve it the reason is I don't know the file product the way.