Have the same issue. Here is the error from the log. I appreciate your help!
[03F4:1F0C][2020-03-08T19:30:09]i301: Applying execute package: MicrosoftFlowRPA, action: Install, path: C:\ProgramData\Package Cache\{4116CF57-AC3A-47B9-A8FA-86DCB0B6F6CE}v0.5.00301.20063\Microsoft.Flow.UIflow.msi, arguments: ' ARPSYSTEMCOMPONENT="1" MSIFASTINSTALL="7" FLOWRPAINSTALLDIR="C:\Program Files (x86)\Microsoft UI flows" FLOWRPACLIENTID="EGhY7F4ZMk9CLVD5lZkFdaO/e8nbiDfP" ADDLOCAL="Microsoft.Flow.RPA.Agent,Microsoft.Flow.RPA.Recorder,Microsoft.Flow.RPA.ThirdPartyNotice,Microsoft.Flow.RPA.Notifier,Microsoft.Flow.RPA.UIFlowsClientDll,Microsoft.Flow.RPA.RDPConnections,Microsoft.Flow.RPA.ChromeExtension,Microsoft.Flow.RPA.StartupNotifier,Microsoft.Flow.RPA.Settings,Microsoft.Flow.RPA.LogShipper,Microsoft.Flow.RPA.LogShipperOptIn,Microsoft.Flow.RPA.UIFlowService,Microsoft.Flow.RPA.AgentLauncher"'
[03F4:1F0C][2020-03-08T19:30:12]e000: Error 0x80070643: Failed to install MSI package.
[03F4:1F0C][2020-03-08T19:30:12]e000: Error 0x80070643: Failed to execute MSI package.
[32F4:00EC][2020-03-08T19:30:12]e000: Error 0x80070643: Failed to configure per-machine MSI package.
[32F4:00EC][2020-03-08T19:30:12]i319: Applied execute package: MicrosoftFlowRPA, result: 0x80070643, restart: None
[32F4:00EC][2020-03-08T19:30:12]e000: Error 0x80070643: Failed to execute MSI package.