If you are using version 1.5.1 you can NOT use files from earlier versions it will distroy your board. If you have not upgraded to version 1.5.1RC1 it is highly suggested.
It won't mess up your design if you don't over write your template and by using the upgrade utility it wont wreck any settings so as long as you save you template you should be fine in upgrading.
Again it is highly recomended you use the latest version so that it fixes any bugs and security issues and improves performance on your boards. Thank you
