Click the LR menu:
Help >> Updates
Install LR5.7.1 if you are running an earlier version.
hmmmmm I have gone to help and updates and when I click on it it takes me only too lightroom cc and doesn't show 5.7 you are correct im only running 5.2
Many thanks 99jon im now up and running again and have the photos processed and loaded on to the old facebook All the very best and thaks for your help :-)