I suspect there are potential issues on some systems with the Google "combined" version, when I installed it I had recieved a copy of the Google complete version free because of my purchase history. I was advised that I could install over the Individual Plugins I had. I never got as far as trying it with Lightroom, only in Elements. The plugins appeared but the load times were abysmal and I mean realy bad , far longer than the Nik individual Installs, so I dumped it and reverted to the originals. Pity cos I wanted the Sharpen Plugin that I have'nt got. After reverting all was back to normal The Nik individual Plugins load very quickly. It was this that convinced me there is a difference in the Google setup.
There are people on here with far more knowledge than me, hopefully one of them can help you, alternatively you might try asking Google for help with this.