Suspicious "Safer Update" Installer

HELP!
For a few days now this Installer labelled “Safer Update” continuously pops up at intervals requesting UAC ‘allow changes to your system’.
On show more details > information it reveals an expired certificate “DigiCert High Assurance Signing CA-1”, validity From: 2016/09/06 to: 2019/10/04
Registered to Avast Software s.r.o. or so it says.

Task manager processes - Filtered
AvastSvc.exe 3672 Services 0 55 976 K
AvastBrowserCrashHandler. 12528 Services 0 1 252 K
AvastBrowserCrashHandler6 13140 Services 0 432 K
AvastUI.exe 11252 Console 2 35 296 K
AvastUI.exe 8512 Console 2 6 256 K
AvastBrowser.exe 10312 Services 0 5 240 K
AvastBrowser.exe 16092 Console 2 56 536 K
AvastBrowser.exe 17784 Console 2 7 104 K
AvastBrowser.exe 1168 Console 2 8 596 K
AvastBrowser.exe 2336 Console 2 18 388 K
AvastBrowser.exe 13232 Console 2 18 384 K
AvastBrowser.exe 1916 Console 2 18 380 K
AvastBrowser.exe 6260 Console 2 18 368 K
AvastBrowser.exe 17292 Console 2 18 380 K
AvastBrowser.exe 12460 Console 2 18 380 K
AvastBrowserUpdate.exe 9156 Console 2 11 132 K
consent.exe 13408 Console 2 11 564 K
DropboxUpdate.exe 5108 Services 0 1 084 K

Looks Suspicious to me and therefore I keep rejecting but I have not been able to find the source or disable it and Avast Full\Memory\Boot-Scan Scan come up clean.

Regards
Alain

I’ve forwarded your concerns to Avast. Let’s see if that helps.

Hi,

This would be from Secure Browser if you have an old version or upgraded from an old version.

I am having the same problem. Is this Safer Update installer pop-up legitimate and should I give Admin approval to continue?

If so, why did this just start happening. I have used Secure Browser for years and have installed several updates but this is the first I recall seeing this message. My current version is: 83.1.4957.117 (Official Build) (32-bit)