The original retail version required a disc in the drive and a specific license key per language. The "complete" version users refer to is almost always the that includes:
: It is the final engine compatible with the broad library of Version 3 language packs (Level 1 through 5), which are not backward compatible with older versions. Key Features of the v3.4.7 Era Dynamic Immersion Rosetta Stone v3.4.7 As Complete As You Can Get...
Cons