3.0 can open all 2.24 and 2.25 beta tunes without a issue.
The only real issue if you want to call it that, is that your custom configs for whatever do not carry over directly. The histogarms do however.
Many members/people hate the fact that all the years they put into making configs are no longer able to work with the 3.0 and they do not wish to remake them all. They say the 3.0 offers a far better and easier setup for configs but I haven't tired it yet. I also don't tune anything but my own stuff really and have made maybe 4-5 configs total in the 4 years I've owned it.
You can just back up your 2.24 and then download 3.0 and have both on your computer.
