Thank you for improving avast accessibility. I tried to install avast on a virtual machine with the NVDA screenreader, and I could get by pressing the tab key to the install button, and I could also check the button for the installation of chrome browser. Later, I didn't disable the self-defence mode, to check, if the screenreader could have access to the interface of avast free antivirus, and read the elements of it, for example the status button, or smart scan button. And it works.