When I enter the serial number and code, I get the message "please enter a valid
serial number".

  The serial number entered must start with ESD or ESM or ESG.

When I enter the serial number and code I get the message "invalid license number"
or "invalid code".

  If this is the first time you are starting a trial period, the supplied code 
  must be entered to activate the trial within 30 days. If the 30 days have expired,
  you can e-mail support@c-emc.ca to obtain a new code.
 
  If this is a licensed version and you reinstalled or installed it on
  a different computer, the code may no longer work. 
  Please e-mail support@c-emc.ca to get the code re-instated.
 
How do I obtain updates for rapidAER?

  Updates are announced on the versions page and to subscribers,
  and can be downloaded by registered users.

I can't change information on the control pages or the meteorology and receptor pages.
  
  When rapidAER has been run in MULTI mode, these pages are locked because you cannot
  change the receptors, meteorology or model options. 
  
  You can change or add sources and buildings, in which case the run will be executed
  in MULTIU (Update Mode). In this mode you specify which sources are to be included
  in the run.

  If you do want to rerun the MULTI run you have to Reset the run. This is done from the
  Run Setup button on the power bar by selecting Reset Run.
  You will be asked if you want to delete the existing .nc1 file. 

  If you respond with Yes the model will rerun the base file. 
  If you respond with No, the model will not be run.