32-bit Syncthing for Windows wasn’t upgrading from 0.13.9 to 0.13.10, saying access is denied to syncthing.exe. I didn’t have the time to investigate further (not my PC), so I just updated it to 0.14.4 manually for now.
Thing is, the folder that holds the executable also had many files named syncthing, totalling over 4 gigabytes. I’m assuming that every time upgrading failed, the new file that couldn’t be used to replace syncthing.exe was left in the folder with a new name. I’m not sure if this issue is already known, but this could be problematic on a device without much storage space.