When installing Devolutions Gateway on the same machine as Devolutions Server (side by side installation), this error can trigger in the installation logs.
Method not found:'Void System.Management.Automation.Runspaces.InitialSessionState.set_ExecutionPolicy(Microsoft.PowerShell.ExecutionPolicy)'.
Solution
As Devolutions Gateway requires at least PowerShell version 5.1, please update PowerShell to that version to fix the issue. Then start over the Devolutions Gateway installation.