Hi Anita.
Case 376543 has been created should you need to contact us directly.
The file you have downloaded with the as4a file extension is the ActivInspire resource pack.
Please download ActivInsire from here. Once installed you can launch ActivInspire and click on File>Import>Resource Pack to my resources... and this will import the resource file that you have already downloaded.
If you still have any questions please do not hesitate to reply.
Adam
Promethean Technical Support