@libreoffice Windows 11. A couple of days ago I was running the then latest version. On starting it, it said it was updating to a new version (I wasn't asked whether I wanted it to - I didn't want it to, I just wanted to open a file).
Having done that, or failed to do it, I don't know which, it now doesn't work at all. Open the application or open a file and nothing visible happens. As I happen to be a techie I tried looking in Task Manager, where I saw two, or sometimes three, processes get started, but they apparently sit there doing nothing at 0% CPU.
The shortcut on my desktop is labelled "LibreOffice 25.8, which presumably failed to get updated on a previous update. There is a file called "C:\Program Files\LibreOffice\LibreOffice_26.2.4.2_Win_x86-64.msi" dated 30/06/2026 (again, not something a non-techie Office user would know to look at), which is presumably something to do with the attempted update that broke everything.