only to allow to install additional components if the license exists for them.
If I haven't the license yet, Plesk allows me to install additional components like PostgreSQL and Tomcat. I then cannot start the services, of course. If I order those articles from my ISP then and if I tell Plesk the new license by importing the new license, it shows me that I can start the service (which could be installed without the proper license before), but if I start the service, it shows me the error message "Error: Unable to make action: Unable to manage service by pg_manage: Error: Unable to start PostgreSQL. 1 ('--start', 'postgresql')" (similar error message for Tomcat). If I try to uninstall the component, so that I can reinistall it, it tells me: "Error: You own the newest product version and all selected components are installed already. Installation aborted." (I see the error message in German). I wanted to uninstall it, but that doesn't seem to be possible. I will have to reinstall the whole server including Plesk now again. I slowly start to scream. I'm an IT systems administrator by myself, Plesk ist the biggest crap I have seen in my life if it isn't able to install additional components correctly, I'm slowly going to install my own server since it looks far easier than to get components running below Plesk!!! I'm sure everything it would work without any problems then.
Unfortunately, we have to close your request, because over the years it has not become quite popular for further implementation.
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IG