If you are trying to install Advance Steel 2017 or later and you get a message that a newer version is already installed. You will be ok to just click the OK button to continue with the install.
You should install Advance Steel from lowest version to highest. You can click the OK button to keep moving forward with the installation.
NOTE: When you get an error that doesn't tell you what version of this application is already installed look in the upper left corner it will indicate what its trying to install at that time.