You can try it without uninstalling the previous version. I have both 1.7.7 and 2.0 installed and can use either without any issues.
Final mesh quality seems to be better in 2.0.
Another improvement is the option to save or load a project in turntable (autoscan) mode as with freescan mode.
There's also an option to set the number of turntables steps (or rotations) from 8 to 180 if you need to capture more angles.