How do I know my free edition of Avast is 64-bit or 32-bit version?

Normally, I am used to find such information in any software by going to Help Menu > About submenu
But, I couldn’t anywhere this information when I looked around different windows in Avast even where there was a least chance of finding this info (ex: Home, Maintenance, Security, Support, Settings,etc.)
May be I missed it somehow.
Request for a clue where to find it.
Thanks.

there is only 32bit … but it works on 64bit OS