Your problem was caused by:
- you not having run the FSDT Live Update, because your log shows you had an older version of Couatl.exe.
- the program couldn't find your custom texture folder or your own account folder, which is of course not normal, most likely a permission problem in your user account.
It's likely you fixed this with the installer, which reset correct file permission on your user folder. The program cannot automatically fix itself, in case you or some other program ( antivirus, for example ) changes file permissions on a folder you should always have permission to access to, only the installer can do that.