I purchased 4 Professional Edition antivirus program on 4 PC(s). I can not get the 4th registration to take. I get an invalid registration notice. I’ve typed it in many times. Please help.
angelbev48
See the tutorial: http://www.avast.com/files/tutorials/insert_key.htm
Please take a look here: http://www.avast.com/eng/faq-invalid-license-number.html
Is your system date/time correct?
Do you use copy & paste method?
Are you sure you do not include the ‘last blank space’ in the paragraph while copying & pasting?