You’re welcome.

Only thing I can (and did) is providing information with the knowledge I have.
Nothing more, nothing less (as they say)

I don’t have any indication at all that you don’t have a legitimate version.
If you have downloaded through a browser…
Almost(?) all browsers have a place where you can see the downloads.
I would check there (if possible) to see where you got avast from.
If it is CNet or avast, you don’t have to worry if you have a legitimate version or not.
You will have one. :wink:

Just some suggestions…
Go through the settings and look at them.
Learn what they are about, what they do etc.
It may become handy to know these things.
I find this a good practice for all software.
Sure, it will cost you (some?) time to do so, but it can prevent problems