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You may experience a problem when trying to install the latest CU for May after upgrading from 4.6.6 >>> 4.6.10 >>> to the latest version of K2 Blackpearl 4.7, (latest version 3).
When you run the Cumulative Update you get the following error: K2 (4.12165.1595.0) detected, this update is intended for K2 (4.16060.2000.0)
This error occurs when upgrading from 4.6.6 to 4.6.10 to 4.7.
This is only seen when applying the latest CU for May.
A script can be obtained from K2 Support that will remove the old registry keys from the system and allow you to run the CU successfully.