• Use the RMM Dashboard and delete the machine, then wait.
• Uninstall the Advanced Monitoring Agent on the PC, then wait.
• Or from an admin command line:

"C:\Program Files (x86)\Advanced Monitoring Agent\winagent" /removequiet

or

msiexec.exe /x {6e53f300-1926-4e2c-9511-d1f6e9a23606} /qn

and

C:\Program Files\N-able Technologies\EndpointSetupInformation\{7f8f4e40-cd16-4efb-383d-3bddd344b4a8}\installer.exe