Key license: how to finish the whole process of purchasing avast

I purchased avast 4 Professional for 1 (one) year and don’t know how to finish the process. I updated avast 4 Professional for 1 (one) year but didn’t ask me for any license key which make me think I didn’t finish the process properly. Could you please help me on that? Thank you

You have to add the new key into avast. See the tutorial: http://www.avast.com/files/tutorials/insert_key.htm

If you still have problems, please take a look here: http://www.avast.com/eng/faq-invalid-license-number.html

Welcome to avast forums and Happy New Year.

But, I don’t know where to find the registration link. Can you help me on this??? Thanks

If you buy avast Professional version, you should have received an email with the key.
If you’re using the avast Home version, register here: https://secure.avast.com/scripts/register.php?lang=ENG

I purchased avast 4 Professional edition but I just want an antivirus for my computer at home, which now I saw is free. I’d like to cancel my order. Where should I sent an email to do so? Thanks

Home Edition and Pro edition have got the same captabilities, but pro edition have got more settings.
You can see here:
http://www.avast.com/eng/av4_version_comp.html

Are the same AV, but really aren’t the same.

But, if you want cancel your order, i think you may mail to sales.

Hmmm… You probably should complain at the site you’ve bought it (paypal?).
You can send an email to sales (at) avast.com.
I hope you haven’t bought a license from a site on this list: http://www.avast.com/eng/fraudulent-sales-of-avast-products.html