Thought I'd add a quick post regarding an issue I've experienced upgrading Qlik Sense server. This was from the April 2018 to both the June 2018 or September 2018 versions.
The problem would happen after the Service Dispatcher was being installed. Once this stage occurred then a rollback would be started. Unfortunately this would also get rid of most of the April 2018 version too and need a re-install.
Checking with Qlik I got this response:
I have taken the ownership of this case. From the logs, I see the Service dispatcher fails to install while trying to execute a powershell script with the following error:
File C:\Program Files\Qlik\Sense\AppDistributionService\Configure-Service.ps1 cannot be loaded. The file C:\Program Files\Qlik\Sense\AppDistributionService\Configure-Service.ps1 is not digitally signed. You cannot run this script on the current system. For more information about running scripts and setting execution policy, see about_Execution_Policies at http://go.microsoft.com/fwlink/?LinkID=135170.
In June 2018 and higher, Dispatcher service installs ADS (App Distribution Service) which requires certain powershell scripts to be invoked by Sense installer. Looking at the error above, the execution of powershell script seems to have failed either due to group policy restircition or powershell settings on the server.
While the following link talks about one possible cause/resolution, please check with your I.T. team about the exact root cause and solution here.
My issue was resolved by checking the PowerShell execution permissions and having them amended to allow unsigned scripts. There are multiple levels to these permissions so if you only have certain levels that allow unsigned scripts then one of the others may be blocking this.
Once this was changed, Qlik Sense September 2018 installed successfully!