Please use the below link for manual update for Lightroom to 2015.5./6.5 version.
Let us know if that helps.
thanks for your quick reply, but - no joy. i loaded the updater at the link above, downloaded the update, but the update failed:
Lightroom CC/6 Update – March 2016
Installation failed. Error Code: U44M2P7
sorry, Mohit (done in by autocorrect)