The computer clock must be within a small error margin in order to generate the proper authenticator code. We recommend using a NNTP server in order to keep your computer clock synchronized.
Your Remote Desktop Manager is set to authenticate with Yubikey or Google Authenticator. You no longer have the Yubikey key or the Google Authenticator and you want to turn off this option to connect on Remote Desktop Manager.
If you had installed using the default settings, the configuration file is %localappdata%\Devolutions\RemoteDesktopManager\RemoteDesktopManager.cfg
You can choose to simply delete it, obviously all of your settings will be lost, alternatively you can open it and remove everything between the EncryptedDataSources tags. You will have to re-register all of your data sources and point to either the file or database that you were using.
Empty Encrypted DataSources