Which one? There isn't anything you can do to correct the bug. A lot of users are waiting with great anticipation for the next update.
my lightroom is now inoperable. Can I go back to the previous version?
Yes. If you will provide a few details about the problem you are facing, we might be able to help you. We need to know:
What operating system?
What version of Lightroom?
What problem are you seeing (describe in detail)?
When did this problem start to happen?
Are you receiving any error messages? If so, quote the error message exactly.
The problem seems to have corrected itself. There may have been some things running in the background that finally cleared. It’s very responsive now. I’ll let you know how it goes.