In your license confirmation email, you should have received a link to manage your activations. Visit that link and deactivate any of the computers that you are not using. If you only see the computer that you are currently trying to activate, deactivate it to reset the activation on your license. If you purchased a license before March 2013, you likely do not have the link to manage your activations in your confirmation email, but you can send us an email with your activation code if you would like for us to generate that link for you.
Once you have deactivated any old computers or systems that were using your license(s), try the activation again. It should work for you this time.
Another possible problem could be that you are entering an incomplete or incorrect activation code. This would often lead to a “Activation not found” error message. Make sure you copy and paste the complete, correct code from your confirmation email. We recommend copying and pasting the code to avoid any typing errors. Many people often confuse the letter O with the number 0. It is also easy to confuse the letter I with the number 1 or the lower case letter L.
If you continue receiving an “Invalid” activation error message, you may have purchased a license for the wrong computer platform. Send us a message with your activation code and describe the error message you receive. We will have a look at it and advise you on how to solve the issue.
If the error message you receive says “Oops,” then it is likely that your computer is not able to reach the activation server. This could be due to firewalls or high security on your network. Please make sure your computer can communicate with http://activation.airserver.com. You may also want to try the activation from a different network.
Finally, if you are behind a proxy server, you may also experience some activation issues.
Activation will try to connect to “activation.airserver.com” using https. If a direct connection cannot be established then an attempt will be made to see if the current user has proxy settings set for Internet Explorer, if that is not the case (as it might be if the installer is being automated) then it will attempt to use DHCP and/or DNS A record to obtain the proxy settings. If you have a PAC script make sure that the identity running the installer has enough rights to access it if it is on a network share (NTML/Negotiate authentication).
If you are having trouble configuring proxy settings for the user that is doing the actual installation (i.e. the user context that GPO or SCCM launches msiexec.exe under) then they might want to advertise proxy using DHCP or DNS. I would recommend allowing activation.airserver.com to not require proxy (i.e. create a valid route for it). Alternatively I would suggest reading the following (however I am not qualified in this area and this is just a suggestion):
Automatic Discovery for Firewall and Web Proxy Clients
“Automatically Detect Settings” Does Not Work if You Configure DHCP Option 252