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You would be able to but I wouldn't recommend it.
Rather just clean install.
My understanding from an IT consultant who works with Microsoft locally is that you will not be able to upgrade from the RC version to the real mccoy. In other words: you will have to wipe everything and start again. Beware and Be Aware!
+1 Upgrading your OS is never a good idea, although Microsoft usually "Support it" I'd also say go with a clean install.