Ivanti Workspace Control Relay Server 10.2.500.0 installer generates the following information:
"Service "Ivanti Workspace Control Relay Server" (RESRLS) failed to start. Verify that you have sufficient privileges to start system services."
Install Microsoft .NET Framework 4.7
From Ivanti Workspace Control 10.2.700.0 or higher, an error message will be displayed during installation if Microsoft .NET Framework 4.7 is not installed.