From the Adobe Creative Cloud App.
If you have the CC Desktop app installed, LR should be listed in it with an Install button. If you have just removed LR, you may need to sign out of the CC App and sign back in to get it to check what is on your computer:
You can get various CC apps from here:
LR 6 and the various updates are here:
Thank you very much for the solution I get
I am lucky that LR is back on my pc!