When I wont to update 6.0 to 6.4, it become a CC version 2015.4 !! I wont to stay in 6.4 and NO CC version !! Do you have a specific process for that ?
See if this link helps:
Please update from the direct patch Keeping Lightroom Up-to-Date
Once done refer How to convert a Lightroom CC trial to Lightroom 6
Let us know if that helps.
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