While busily working on 4.1 we ran into a rather annoying bug in 4.0.2 that really needed to be addressed in the meantime. Randomly Subsurface 4.0.2 doesn’t correctly download files from a dive computer. The dialog will show a completed download, but nothing will be added to the dive list.
The website has updated 4.0.3 binaries for Windows and Mac. I assume that the Linux package maintainers will update their versions as well, soon.