I have just tested a few things with the version 4 and I am able to open version 3.18 designs of mine and edit it.
The functions are the same from 3 to 4, but I did notice a few cool things in that of rotating the flat model and few new functions like Highlighting the bend lines some of the 2D options have now become icons to speed things up.
I quickly tested a model and the way one does joining and moving faces around is still the same.
I am happy with the new version.
:-)
R
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