Whilst they owe me nothing with the amount I played my CD, feels a bit harsh to trade on the 30th aniversary but only support much newer sales.
They have modified the engine heavily since and thus it doesnt really roll back to the older releases. Also, I think it is on discount currently and only costs a few dollars.
The quality of life improvements are done very well and I would recommend. Heck even if just for the new lighting engine.