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Unless E-xoops has a 2.0.6, I am guessing you are not talking about a simple upgrade from one build to another. XOOPS does have a 2.0.6 so I am going to further guess that you are talking about changing from E-xoops to Xoops, which are not the same thing.
Wish I could help, because XOOPS is definitely the way to go, but I have no clue about anything E-xoops; I have honestly never even looked at it. When you do make the change, though, I think you will be pleased.