Hello emel and welcome to the forum.
1. Can you clarify for me what
product of Avast you are using -- Free or Pro or AIS?
2. Is your laptop and desktop the same OS (operating system)? Can you please tell me what they are? If I understand correctly, everything works fine in your laptop, but it is your desktop that has the problem...correct? Your screen reader works fine with everything else on your desktop except Avast on your desktop?
3. I am slightly confused as to what you are looking for here: Are you looking to download version 5.0.677 again or something else? Yes, there was a recent upgrade, but you can also change your settings to NOT automatically get the upgrade and just be notified of the upgrade and you can do it when you are ready just by clicking a button. To do this, open the Avast GUI > click on Settings > Updates > under Programs click on "Ask when an Update is available" (middle button). When a Program update is available, your program version on the Summary/Main GUI page will turn from green to red and there will be an "Update" button to the right of the version number -- just click this "Update" button and the version will automatically update for you when you are ready.
4. Some people are finding the colors and font/print of the GUI difficult and too light who are not having visual impairments. Suggestions have been made to the Avast developers for improvements for future versions; this is to be determined.
If I misunderstood you in anyway, please clarify. Thank you.
How can I help you further?