I then removed Photoshop to ensure I was working with a clean copy and then downloaded and installed Photoshop (2017) again.
I have extracted the contents of the .zip using WinRAR to the location C:\Program Files (x86)\Common Files\Adobe\CEP\extensions\LightningStorm_CC2015\
I opened Photoshop and clicked Window > Extensions > Lightning Storm. I received an error message that the extensio is not correctly signed.
By the way (I'm not sure whether theis is pertinent) there is still a copy of Lightning Storm installed in Program Files (rather than the 64 bit program folder) from a previous aborttive attempt to install Export Kit
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