It works, you can 1st try to use the "Wii Backup Manager" and Transfer the file to ISO into the "WiiVC Injector Script [2.2.5] / SOURCE_FILES " if that doesn't work check the file user permissions.
I had the same issue earlier, on my computer I had to change my permissions for it work, I notice when I couldn't delete the folder after running the script. Well if you "Right Click" The "WiiVC Injector Script [2.2.5] folder, go to properties, then under "security" tab, click on "advance" at the bottom and click on "Disable inheritance" and then "Convert inherited permissions into explicit permissions on this object" and Click "OK" it should work, best of luck to you.