I have been a paying customer of Avast since version 4, and up to now have been extremely satisfied with Avast until this current version 9.
I have always appreciated the popup that informed me that my virus database had been updated, but I certainly do not appreciate the "Buy Now" / "Find Out More" popups for additional Avast software that I have been getting recently.
I chose to renew the Internet Security version for 3 PC's for 2 years because it suits my needs, so I do NOT need daily popup adverts from Avast for features I had decided NOT to buy eg. Avast Premiere, Secureline VPN, Easy Pass, Avast Backup etc. One of the items on the Avast 9 user interface is "Store" where all the available upgrades and products are listed, so the "Buy Now" / "Find Out More" popups are unnecessary.
If this aggressive selling on the part of Avast does not stop soon, I will not be renewing my licences when they run out in 6 months time. Reading through this thread it seems there are others who this also upsets, so it would be a shame if the Avast team lost customers due to this.
One solution to the problem may removing version 9 and re-installing version 8 if it can be obtained somewhere. The update to version 9 kept crashing my wifes PC (Vista) and we had to revert to Avast 8 for it to run, and it seems that she gets none of these unwanted pop-ups.