The releases, you can review release notes online for each release of
Creator, show bug fixes, as well as new capabilities, and modules. Because
of the former its importent to evaluate the impact on your designs, and either
update them (and their code) or risk unforseen field failures and incon-
sistent product performance.
Unfortunately (or fortunate depending on point of view) technology does
not stand still, nor do the devices offered nor do the tools stay stagnent.
There is no easy fix short of buying up all old obsolete stock and using this
until one runs out of production parts. But the code upgrade is not that difficult
in general as I think you will find.
The first time you opened your project in Creator 3 you have been asked to update it and create an archive (default: Yes) from the original file. Search for that archive-file which you may still open in Creator 2.