I think you might be better off to download and install the latest version(s) of RiffWorks. The special Line 6 Edition of the software is no longer necessary (or supported) since the commercial versions are now compatible with Line 6 devices.
The free version (T4) is here:
The more feature-rich Standard version is here:
Previous owners of Line 6 RiffWorks edition qualify for a deep discount on the Standard version. Details are here: