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You do not have to uninstall the CC version.
LR 6 and CC are exactly the same program. the difference comes from how you Sign In.
Sign in with an Adobe ID that IS associated with a subscription and it becomes the CC version.
Sign in with an Adobe ID that isn't and never has been associated with a subscription and you are prompted to enter a serial number and it becomes the 6 version.
So all you have to do is have an Adobe ID that isn't and has never been used for a subscription and Sign In with that then enter the serial number.
So if you Signed in then Sign Out then Sign back in and you should get a prompted to enter the serial number you received after you buy the stand alone 6 version.
Lightroom 6 and Lightroom CC are the same program, installed with the same installer. There is a difference in features based on how the program is activated/registered. If you register it as Lightroom 6 then you won't have the dehaze filter and other new features that have been added since Lightroom 6 was released. But it IS the very same program.