lightroom 5.7.1 has stopped / lightroom classic
I would be very grateful for help on the following issue.
I have had Lightroom 5.7.1 for many years, and have used it regularly.
The catalogue has about 57000 photos.
This morning on opening the software, it looks as if everything has disappeared.
I attach a screen shot.
it is literally a blank screen inviting me to "import".
I am aware that 5.7.1 is no longer supported, but understood that it was was stand-alone and that I had control.
Is this an abnormal situation (it certainly seems so) ? And if so can I recover 5.7.1 as before ?
If not, my only concern is to be able to have the existing catalogue recognised by whatever new version I need to turn to.
Any help will be most appreciated.

