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I've got a client who is looking to upgrade from 3.0.1-GA... is it possible to upgrade to the latest? Or is there an intermediary upgrade to perform first?
I dont know for sure. The readme for 4.5.7 indicates that you have to be running at least 4.5.2. So you might go to the previous versions and see if you can find the readmes for those and work your way backwards. It's probably going to be a multistep upgrade.