Tor said that an update was available, ran that and all seemed ok. When I click on the icon to run Tor I get: "Unable to start Tor. Failed to get hashed password."
I had the same problem. I made a copy of my bookmarkbackups folder, deleted the tor browser folder and did a clean install of tor 7.5 and then it would start and immediately crash.
I deleted the tor browser folder again and installed Version 7.0.10 and turned off automatic updating.
Win 10x64 pro Version 18299.192