Well, as V4 client has quite a lot of bugs, including the license, you could try using any other client (v3, v2 or v1) I would suggest you use V1, as that is the KTR one too. V4 does not allow people to register license, so just try using V1. I will edit this post and put the link of V1 as soon as I get it, otherwise I hope this helps, and if you have V1 or any of the other clients, use that.
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Subject: License Problem 
