Need to delete service before upgrade?

[MaxMark]

1. Brekeke Product Name and Version:
Sip 3.9.5.5
2. Java version:
jre 1.8.0_161
3. OS type and the version:
Windows server
4. UA (phone), gateway or other hardware/software involved:
N/A
5. Your problem:
I'm testing an upgrade from version 3.9.5.5 to the latest 3.9.5.8. I stopped the Brekeke service, got an sst backup through the web UI and copied the sip directory from under webapps, then ran the 3.9.5.8 installer as admin.
Part way through I got a 'Failed to install Brekeke SIP service.' error.

In the service-install.log I found:

Install failed: 8 The specified service already exists.

Failed to install service.

Do you need to delete the Brekeke service before upgrading as well as stopping it?

[Harold]

Have you uninstalled the existing Brekeke SIP Server?
If so, let you restart the Windows.

[MaxMark]

I didn't uninstall it completely, I don't understand why I can't do an in place upgrade? Also, This is a Java webapp running in Tomcat, surely you only need to restart Tomcat? Why do you need to reboot Windows?

[Harold]

You don't have to use an installer if it is a minor version update.
Just upload the sip.war file at [Update Software] page.

For updating Tomcat web server, uninstall the Brekeke SIP Server completely, reinstall it with the installer and restore the copied directory.

A rebooting Windows will clear resources the service held.