message: Run msiexec with start /wait
diff: @@ -62,6 +62,9 @@ namespace
  const auto code_and_output = cmd_execute_and_capture_output(
  Command{"cmd"}
  .string_arg("/c")
  + .string_arg("start")
  + .string_arg("/wait")
  + .string_arg("(no title)")
  .string_arg("msiexec")
  // "/a" is administrative mode, which unpacks without modifying the system
  .string_arg("/a")
  