Install the new version of Visual 6.3.8 to the default locations.
Those default locations are:
When prompted for the location to install the config files enter the path to vmfg.
After everything is installed open regedit and delete this key:
HKEY_CURRENT_USER\Software\Lilly Software\VISUAL Manufacturing\Configuration\Local Directory
If this key is left in the registry then the old version of visual will try to get it’s serial number from the new version of Visual.