Libre5.0 will not load after crash

I had been using Libre 5.0 all day. It crashed, and I got popup message saying the items on which I was working would be restored the next time app was launched. I have been unable to get app to load, even after re-booting my computer. Now, I’m trying to install a later version - Libre 5.4.1 or somesuch, but the installation was “interrupted” for no apparent reason.