Program only works correctly when the whole folder is copied to C drive before the installer is run

[wdstudios2]

Running the installer from an external hard drive results in errors when you try to run 16-bit windows programs.

[cracyc]

It's probably not a good idea to use the installer from an external drive. If the drive letter changes things will break, running otvdmw directly would be better in this case. Also if the drive doesn't have short filenames enabled and the installed path has spaces or has directory names longer than 8.3 chars you'll have likely problems either way.