I may be wrong but, it sounds like you have the multiplexer and different versions of the software and you want v43.
Several of us have bought from Yohotech and like Twins says, came with v43 on a HDD.
From what I've seen so far, Yohotech is not going to supply you with the install DVD's except the files to use DIS v55 and SSS through VMWare Player.

I get what you are trying to do.
I also wish that I could get v43 coding/programming capability in DIS v55.
Jose, I was on the right track when I made that request for the base install discs.
I would kick v43 HDD to the curb!!

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