In case of error, you can verify the local application log, which is available from the menu in Help - View Application Log.
Those logs are saved in Macintosh HD/Users/Username/Library/Application Support/com.devolutions.remotedesktopmanager/RemoteDesktopManager.log. You can view it as a list which can then be filter by Date, Message, Version, Info, Error or Error Silent.
Increasing the log level
When requested by a Devolutions employee during a support process, you may be asked to increase the log level of the application to a higher level.
This can be done via File - Preferences - Advanced.