When you are operating within an RDS server, it’s important not to install Quickbooks or Quickbooks updates without invoking the change user /install command first. Make sure that you are logged in as an administrator and open an elevated command prompt. Enter the following command:
change user /install
Once the command is executed, you will be notified that the server is now in install mode. Proceed to install Quickbooks or Quickbooks update at this time.