Where and when exactly are you getting this message ?
The download in itself doesn’t give/have any checking involved until you actually try to run it after download. Note in my image I save the file and not try to run it directly.
If it is happening when you do run it, try a repair of avast.
I did one better. I installed it brand new on a seperate computer. It updated to database 160331-2. which is March 31, 2016. So this is not a problem on my end.
Support for old versions has stopped, however I’ve not seen any statement that vps updates have stopped for them though.
There was (still is?) a problem with the updates starting at 31 march.
Although avast said the problem was fixedm it looks like there still is something wrong. https://www.avast.com/virus-update-history
I know Android devices do not get updates, perhaps old versions of avast have the same problem.
But using 4.8 on a X64 system ?
Come on, get it over and done with and install the latest 2016 version.
As has been mentioned it would appear to be the last VPS update - which I found hard to believe - if it hasn’t moved forward from that date.
There have been numerous deadlines for end of support for win9.5/9.8, etc. and they used avast 4.9. However, many business systems still used avast 4.8 and this inadvertently meant avast 4.8 (and the 95/98 OSes) support continued.
As an avast user like yourself, I have no knowledge if this is the end of support for avast 4.8 or not.
First you need to download and install SP3. After installing SP3 check again for any available updates. After that download avast uninstall utility, but don’t run it. Uninstall your current version of avast and follow the instructions. After that disconnect your computer from the internet. Manually run your computer in windows safe mode and run the avast uninstall utility and follow the instructions. After that download and install the latest version of Avast (using custom installation and untick any unnecessary optional program you don’t need (it is located at the bottom) . After that a pop up window will appear saying what’s new in the version (at the bottom left hand corner make sure you untick google chrome only if you don’t want it) and click on finish. After that Avast GUI will appear and it will say finishing installing and after that close the AVAST GUI and restart your computer manually. After register register your copy of avast.
Note: Registration is FREE and you will only need to register once every year.