You seem unable to uninstall Remote Desktop Manager from Programs and Features in Windows. In the Event log; you see the following error message;
Event Log Message
Please try the suggested fix by Microsoft here; https://support.microsoft.com/en-us/help/17588/fix-problems-that-block-programs-from-being-installed-or-removed.
Your settings and local data for RDM are by default under %LOCALAPPDATA%\Devolutions\RemoteDesktopManager, our installer doesn’t touch this at all. You must preserve this folder in its current state.
Once this is done, please contact email@example.com for further assistance.