If you can't see the installed Agent in the Devices list, take the following actions:

1. Open Registry Editor: Start > Run > Regedit
2. Navigate to HKLM > Software > Atera Networks > AlphaAgent
3. Delete the AgentID Key
4. Restart the Agent Service

The Agent should appear in your Device list within a few minutes. 

or run the following elevated command

REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\ATERA Networks\AlphaAgent" /f /v AgentId sc stop AteraAgent && sc start AteraAgent