Lr6 deactivate / activate

History:

2015 Jly: Upgraded to Lr6 on Win7 desktop PC and on Win7 laptop PC but this only used on holiday

2015 Sep: catastrophic demise of desktop PC, replaced with Win10 desktop PC.  Lr6 perfectly OK.

2015 Dec: Win10 laptop replaces old laptop.  Lr not deactivated.

2016 Apr: Lr6 on new laptop, OK on holiday but 30-day limit warning.  Forgot to do anything about this upon return.

2016 Jun: Laptop on holiday again, Lr6 30-day limit appears to have restarted!

Now:

Attempts to deactivate Lr6 on old laptop fail as Lr6 will not start up at all - gets to splash screen and freezes "not responding"

The activate option is not apparent under the Help tab on the new laptop.

On Adobe website the 24/7 Chat option is always Closed and telephone support is not available with my Lr6, so I’m turning to this forum for best advice:

How can I activate Lr6 on the new laptop?