Thank you for such a prompt response Deborah, I had trying to open the program from windows search as well as a range of other options. Without success.
I think I have resolved it - but I fear it is a short term option. I went to the backup folder in files and instead of clicking open, I clicked restore - 4 times. The first three times, no success - but on the 4th try an index opened the program.
So annoying, I'm on a timeline (like everyone) and I just lost 3 hours indexing. Now I'll be working late into the night to make that up.
Feeling a bit grumpy
Best to all
Sharon