After upgrading NPM from 11.5.3 to 12.0.0 we have a few hosts that the new agent either won't install or the old agent wont remove.
1. Won't install - error reads
2. Won't uninstall previous version
If you can't uninstall the agent, you are having SO issues. I would use the Microsoft tool "Fix problems that block programs from being installed or removed" and try to reinstall.
What I am trying to say is that your Operation System is not alright, if you can't uninstall something is wrong there.
I would recommend that you use the registry to do it.
Under Programs and Features, the agent is the product name in my case was SolarWinds Agent 1.6.1647.0
Go to the registry search for the ProductName
When you find it, delete the folder.
That will uninstall the agent.
Man, personally, if you are running your 4 servers on a VM I would rebuild them. Something is not right there, the Microsoft tool works pretty well in all my servers..
Did you check the updated port requirements for agents ?
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