What is showing in downloaded files is most likely to be the avast installation/setup file avast_internet_security_setup.exe, not the actual avast installation, is that correct ?

Have you been able to find the avast installation folder location that I gave you C:\Program Files\AVAST Software\Avast ?
You can use windows explorer to look there, or you can do a search for avast software.

Are you able to find the avast! antivirus item in the Control Panel > Programs and Features ?
Also is this what you mean by programs, as I’m still not clear what you mean by this ?