I managed to reproduce the error and solve it. I’ll publish a new revision soon. Meanwhile, you may download https://raw.githubusercontent.com/leandroarndt/msfs_livery_tools/3856b1181f6354344b213e272f3560aaa64a31fe/msfs_livery_tools/vfs/vfs.py and replace the file c:\program files (x86)\msfs livery tools\msfs_livery_tools\vfs\vfs.py (maybe your browser complains about downloading a Python file, but it is simply the existing file with 18 characters added).