How to permanently Switch Off The Download File Checker (Keep or Discard)

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Hello
After a meltdown by Windows 10 I have had to use Microsoft's terrible replacement for System Restore to setup by pc again virtually from scratch. (Did you know that System Restore is OFF by Default on Windows 10? I didn't worse luck).
OK Every time I try and download a legitimate file I get a message at the bottom of the screen asking me if I want to discard this or keep it. It's infuriating especially as it doesn't recognise well know and long established software exe's. (Revo Uninstaller, BoxCryptor, Xplorer2 to mention a few) Can someone please remind me how to switch off this "feature" to stop me going insane, thanks.
Lancashire

(BTW The Verification is terrible for anyone with colour blind problems - I have only ever come across one worse than this)
I am using version 12.3.2.880, Windows 10-64 and Chrome 55.0.02883

[Eddy]

Is the message from avast ?
A screenshot might be helpful.

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Good point, its possible of course that I have assumed its Avast when it's something else responsible.

I am not sure how to attach my screen grab I cannot see a separate textbox for adding files. The "insert image" just adds which I am not sure how to use.
Thanks
Lancashire

[Pondus]

Below the box you write in  >>  Attachments and other options

all avast pop up messages have avast logo / name in it

[bob3160]