I followed the upgrade instructions for Bitbucket but despite that the old Stash Windows service was not uninstalled and replaced with a new Bitbucket service as I would have expected. Or at least I would think that the old service will be starting the new version. However, to run Bitbucket currently on my server I have to manually stop the old service and then run the startup_bitbucket.bat from the installation directory to make it run. Jira service works correctly as before the upgrade.