Clarity Client for Revit Silent Install Options
The ClarityClient2021ClientRevit.exe is built with InstallShield, which supports most MSI-style options, including passing them thru to the MSI.
See this link for install options for the Clarity Client installer:
https://docs.revenera.com/installshield21helplib/helplibrary/IHelpSetup_EXECmdLine.htm