You cannot have multiple installations of DVD Decrypter.
However, my REAL concern would not be that aspect. DVDD had major changes from 3.17 to 3.19, so many in fact, that it's doubtful they'll happen again.
My concern is the halt of the project, due to major let down, if you know what I mean. C'mon, 3 donations?????
One year from now, when the doublelayer DVDR will be here to stay, DVD2DVDR, Rejig, DVDShrink The Big Three etc etc will be either fond memories or exercises of the mind for people with too much time in their hands.
I shall still be using DVDDecrypter, to put the DVD on HD.
I shall still be using DS, as I hate 2+ minutes of silly warnings or ridiculous company logos or stupid trailers before I start the movie I OWN and have backed up.
Being a long time movie collector, I want my DVD to contain only material directly connected with the movie.
I shall STILL be using 2COOls guides to get rid of language menus that pop up upon insertion of the DVD. I respect people that speak Hvartski, but I doubt that I'll ever sit down and learn their language so I can navigate a menu in it.
So in conclusion and long term, if DS stops developing, it will hurt me a lot more than whether Pinnacle will (ever) solve the size bug.
And it pains me to see people with vast knowledge on DVDs to brush off DS
Just some thoughts.