Is there a way to import your 0.9x configuration and list files into the newer 1.51 or do I have to start over?
(I just downloaded 1.51 and haven't installed it yet)
You have to configure from scratch

Edit: what about layouts? I have 5 emulators with custom layouts, can those be imported or must they be re-done?
They can still be used, but you'll need to rename everything from emux*.* to emuname*.* (see the new layouts.txt).
Can the two version co-exist while I bring 1.51 up?
Sure, just install to a different directory

And you may as well use v1.52 now
