"It looks like a conflicting RMM agent is installed on this machine..."

“Please uninstall the other RMM agent, restart the computer, and try again.”

We installed Syncro on this device, and found that a couple of our scripts weren’t running correctly. I upgraded PowerShell from 4.0 to 5.1, then rebooted. Once back up, the Syncro agent refused to start. I uninstalled, rebooted, then attempted to install again. Now that the server is back up I get the error from the title when installing from exe, and from MSI I just get “There is a problem with this Windows installer package. A program run as part of the setup did not finish as expected.”

I’ve gone through and manually cleaned up all the files and registry entries I could find from the previous installation, but it still refuses to install now.

This is Server 2012 R2.

Use the uninstall script, should work. You should also install .net 4.8 if you haven’t. Install a Syncro Agent on a Device