I paid for the internet security 29.99 . After entering my details error came up? what does this mean?
Can you tell us what an error do you get? Or may attach a screenshot. 
Error:
We are unable to perform the selected action. We apologise for the inconvenience.
Error Number: SIT_000002
Thanks
Try to reinstall Avast.
Do you had another antivirus before Avast?
Avast just expired today. Will my credit card be safe
Was this from Digital River ? As it looks to be a problem at their end, have you received an email with the licence ?
No email received bought off avast store .
Just having a quick check my licence was issued by nexus
I reckon an email to Avast sales is in order. I will see if I can get the address