Lightroom 2.6 no files uninstall before ver 4

I currently have no files in lightroom 2.6 can I safely uninstall it before I install ver 4

You don't have to uninstall anything before installing Lr 4 or Lr 4.1.
Lr 4 or 4.1 doesn't touch your Lr 2.6.
Usually, I recommend to leave a prior version of Lr on the system because Lr 4 is quite different, and sometimes one wants to check out things in the familiar (older) version of Lr.
But since you don't have any photos in Lr 2.6 - certainly, you can uninstall it.
But keep one thing in mind: If you bought Lr 4 under an upgrade license, Lr 4 will - during installation - look for a prior fully licensed (= non-upgrade)version of Lr. If it doesn't find one you have to provide the serial # of your prior full license.
So, maybe better just keep Lr 2.6 on your system for a while - you can always uninstall it at a later point.

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