Nintex Newbie

forms activation correlation error

I installed Nintex forms on SP2013 - small farm 1xapp, 1xweb server.

Installation proceeded with no errors.

Trying to activate the forms feature from CA > Application management > Manage web applications 

Choose a web app then from the toolbar > manage features > Nintex forms activate

Throws correlation error>

(POST:http://bccprod-spapp:2222/_admin/ManageWebAppFeatures.aspx? (WebApplicationId=38be74672a384b489b77e5ed37e69f93&IsDlg=1)        0291559e-98a9-9068-c158-2cc9e2236ab0

03/20/2018 23:48:45.72         w3wp.exe (0x34CC)                               0x98E8        SharePoint Foundation                 Authentication Authorization         agb9s        Medium          Non-OAuth request. IsAuthenticated=True, UserIdentityName=, ClaimsCount=0        0291559e-98a9-9068-c158-2cc9e2236ab0

03/20/2018 23:48:45.72         w3wp.exe (0x34CC)                               0x98E8        SharePoint Foundation                 Logging Correlation Data             xmnv        Medium          Site=/        0291559e-98a9-9068-c158-2cc9e2236ab0

03/20/2018 23:48:45.73         w3wp.exe (0x34CC)                               0x98E8        SharePoint Foundation                 Monitoring                           b4ly        High            Leaving Monitored Scope (PostAuthenticateRequestHandler). Execution Time=10.3326679787515        0291559e-98a9-9068-c158-2cc9e2236ab0

03/20/2018 23:48:45.73         w3wp.exe (0x34CC)                               0x98E8        SharePoint Foundation                 Object Cache                         ai107        Medium          Failed on try1 to load XML document at path 'C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\Template\Features\NintexLiveAdminLinks\feature.xml': System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\Template\Features\NintexLiveAdminLinks\feature.xml'.     at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

Here is the strange thing. That file is in the 15 hive.

Even stranger re-running the Nintex forms installer now throws an error 

Existing version of Nintex Forms detected, an Upgrade will be performed
Upgrading Nintex Forms service...
Stopping Timer service on server BCCPROD-SPWFE.
Starting Timer service on server BCCPROD-SPWFE.
Stopping Timer service on server BCCPROD-SPAPP.
Starting Timer service on server BCCPROD-SPAPP.
SPFeatureDefinition Name=FeatureDefinition/15/ada0910e-a663-4db4-a19c-d8a097317b87
Upgrade-NFService : Object reference not set to an instance of an object.
At line:1 char:81
+ ... entlyContinue; Upgrade-NFService}
+                    ~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidData: (Nintex.Forms.Sh...ommands.Upgrade:
Upgrade) [Upgrade-NFService], NullReferenceException
+ FullyQualifiedErrorId : Nin
Clearly the installer now has a problem but was looking for it in the 15 hive.
I will log with Nintex support.