When you install or upgrade Remote Desktop Manager, you receive this error message below;
Installation Error Message
You simply have to deploy the zip file of Remote Desktop Manager in Remote Desktop Manager's installation folder.
By default, Remote Desktop Manager is installed in C:\Program Files (x86)\Devolutions\Remote Desktop Manager.
When the zip file is downloaded, extract or copy/paste the content of the zip file in the C:\Program Files (x86)\Devolutions\Remote Desktop Manager folder. When you will restart Remote Desktop Manager, the latest version will be installed.
You can download the zip here; https://remotedesktopmanager.com/Home/Download