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Yes, in your WoW folder it creates a WoWTest folder (which is like a copy of your wow folder, but with ptr related files). In your WoWTest folder, you may copy over your Interface and WTF folders, though keep in mind that some addons needed to be changed to work with 2.1 and also that you may lose some profile settings for addons since you'd be playing on a different server with a different character name.
The version number is the patch revision number. After downloading the PTR client, you'll need to do about 6 (don't remember how many now) updates to get to the current patch revision. Also think if you want to get on the PTR this late in the game - you'd have to do all those updates and I think the PTR may only be up for another day or two. The most recent patch to the PTR seemed like it might be the last..... But these are just my predictions - I'm not 100% sure of when the PTR will go down or when 2.1 is coming.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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