I did try to run reagentc /disable, it also stalls and gives no response. The only reagentc command that does not stall is reagentc /?. But I did get a response after running "reangentc /disable /logpath c:\temp\reagent.log" as follows:
2024-05-16 06:39:07, Info [ReAgentc.exe] ------------------------------------------------------
2024-05-16 06:39:07, Info [ReAgentc.exe] -----Executing command line: reagentc /disable /logpath C:\temp\reagent.log-----
2024-05-16 06:39:07, Info [ReAgentc.exe] ------------------------------------------------------
2024-05-16 06:39:08, Info [ReAgentc.exe] Enter WinReUnInstall
2024-05-16 06:39:08, Error [ReAgentc.exe] SetWinReOperationSyncKey another installation in progress
2024-05-16 06:39:08, Info [ReAgentc.exe] Exit WinReUnInstall returns 1 with last error: 0x0
2024-05-16 06:39:08, Info [ReAgentc.exe] ------------------------------------------------------
2024-05-16 06:39:08, Info [ReAgentc.exe] -----Exiting command line: reagentc /disable /logpath C:\temp\reagent.log, Error: 0-----
2024-05-16 06:39:08, Info [ReAgentc.exe] ------------------------------------------------------