Single or Double backslash required for target path?

[MattLyte]

Are single or double backslashes required when replacing the target path for a custom install location?
Line 35 uses double backslashes in the If condition, but lines 36 and 37 only have single backslashes. Should I just maintain that same standard when editing for the custom location?

[jendermine]

"The cmd interpreter seems to ignore extra back slashes in directory names"

https://stackoverflow.com/a/21080688