Hi Dan,

For the error message you get:
This is because the Web Server does not have a launcher that matches your application's startup mode, for example, you set the startup mode of the application in project > Client Deployment tab to "Start up with background service", however, you’ve only uploaded the Launcher without background Service (please refer to the article below for details about launcher types). I suggest you can upload both with/without background service to avoid this issue.
https://docs.appeon.com/ps2021/Upload_the_cloud_app_launcher_and_the_runtime_files2.html

For the CAL:
CAL 2021 is compatible with PowerClient 2019 application. CAL 2021 and CAL 2019 have the same name but different in versions. We suggest that you use CAL 2021.

For the app name:
You cannot just copy the app to another folder, the app name doesn’t change in this way; please create a new PowerClient project and use another app name, then deploy it to the web server.

Regards,
Kai

Hi Dan;

  No problem .. the two CAL versions can co-exist on the same web server. The key to remember is to redeploy the CAL if you apply any MR's to PB2019R3 and/or PB2021 to keep them up-to-date.  HTH

Regards ... Chris

Yes we did in the same way but 2021 CAL works fine but 2019 CAL URL throws the error message that i mentioned in my questions. 

Is there any setting that I need to select in the Launcher Profile for both CAL?

I got it. somehow this settings got changed between Launcher Profile & Startup Mode. I fixed it and it works fine.