Have you updated Avast Secure Browser to the latest version? See attached below.
Check what the current version for Avast Secure Browser is (standard user).
Go to 3 dots upper right corner and click that. Avast Secure Browser runs in both user environments and is the same user version for both:
Standard User Mode
Bank Mode
If the standard (non-bank mode browser) is older than the indicated version attached below, then merely opening the About Avast Secure Browser window will start the updating process.